Approval Details

Valid E.O.

Validity

This Executive Order approved the specified parts on on September 25, 1991.
As of Wednesday, January 22nd, 2025 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsRemarks
30051991 and earlier Chevrolet V8 262-400 cidEnergizer Aluminum Rocker Arms, 1.6 ratio, 3/8 stud (for press-in studs)

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-225-1
  • Executive Order 225-1 / D225-1
  • ARB # D-225-1
  • Executive Order No: D-225-1
  • C.A.R.B. No. D-225-1
  • Resolution D-225-1
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-225-1 PDF

D-225-1 Document:

CARB_D-225-1

(Page 1 of 2) State of California AIR RESOURCES BOARD EXECUTIVE ORDER D—225—1 Relating to Exemptions Under Section 27156 of the Vehicle Code CRANE CAMS, INC. ROCKER ARMS Pursuant to the authority vested in the Air Resources Board by Section 27156 of the Vehicle Code; and Pursuant to the authority vested in the undersigned by Sections 395186 and 39516 of the Health and Safety Code and Executive Order G—45—5; IT IS ORDERED AND RESOLVED: That the installation of the rocker arms manufactured by Crane Cams, Inc. of 530 Fentress Blvd., Daytona Beach, FL 32114 has been found not to reduce the effectiveness of the applicable vehicle pollution control system and, therefore, is exempt from the prohibitions of Section 27156 of the Vehicle Code for those applications listed in Exhibit A, which is attached hereto and incorporated herein. This Executive Order is valid provided that installation instructions for these rocker arms will not recommend tuning the vehicle to specifications different from those submitted by Crane Cams, Inc. Changes made to the design or operating conditions of the rocker arms, as exempt by the Air Resources Board, which adversely affect the performance of a vehicle‘s pollution control system shall invalidate this Executive Order. Marketing of this performance package using any identification other than that shown in this Executive Order or marketing of these rocker arms for an application other than those listed in this Executive Order shall be prohibited unless prior approval is obtained from the Air Resources Board. Exemption of these rocker arms shall not be construed as exemption to sell, offer for sale, or advertise any component of the kit as an individual device. This Executive Order does not constitute any opinion as to the effect the use of these rocker arms may have on any warranty either expressed or implied by the vehicle manufacturer. THIS EXECUTIVE ORDER DOES NOT CONSTITUTE A CERTIFICATION, ACCREDITATION, APPROYAL, OR ANY OTHER TYPE OF ENDORSEMENT BY THE AIR RESOURCES BOARD oF CLAIMS OF THE APPLICANT CONCERNING ANTI—PQOLLUTION BENEFITS OR ANY ALLEGED BENEFITS OF CRANE CAMS, INC. ROCKER ARMS.

CRANE CAMS, INC. * EXECUTIVE OROER D—225—1 ROCKER ARMS (Page 2 of 2) No claim of any kind, such as "Approved by the Air Resources Board" may be made with respect to the action taken herein in any advertising or other oral or written communication. Violation of any of the above conditions shall be grounds for revocation of this order. The order may be revoked only after ten day written notice of intention to revoke the order, in which period the holder of the order may request in writing a hearing to contest the proposed revocation. If a hearing is requested, it shall be held within ten days of receipt of the request and the order may not be revoked until a determination after hearing that grounds for revocation exist. _7 Executed at E1 Monte, California, this-_ff&é d eptember, 1991. R. Summerfield Assistant Division Chief Mobile Source Division

State of California AIR RESOURCES BOARD EVALUATION OF CRANE CAMS, INC. ROCKER ARMS FOR EXEMPTION FROM THE PROHIBITIONS OF VEKICLE CODE SECTION 27156 IN ACCORDANCE WITH SECTION 2222, TITLE 13, OF THE CALIFORNIA CODE OF REGULATIONS September 1991

State of California AIR RESOURCES BOARD EVALUATION OF CRANE CAMS, INC. ROCKER ARMS FOR EXEMPTION FROM THE PROHIBITIONS OF VEHICLE CODE SECTION 27156 IN ACCORDANCE WITH SECTION 2222, TITLE 13, OF THE CALIFORNIA CODE OF REGULATIONS by Mobile Source Division State of California Air Resources Board 9528 Telstar Avenue E1 Monte, CA 91731 (This report has been reviewed by the staff of the California Air Resources Board and approved for publication. Approval does not signify that the contents necessarily reflect the views and polictes of the Air Resources Board, nor does the mention of trade names or commercial products constitute endorsement or recommendation for use.)

SUMMARY Crane Cams, Inc. has applied for an exemption from the prohibitions of Vehicle Code Section 27156 for their rocker arms for installation on 1991 and older General Motors (GM) vehicles equipped with 262 CID (4.2L) to 454 CID (7.4L) V—8 gasoline engines. Crane Cams has submitted a completed application and all the required information, as well as exhaust emissions test data performed at Crane Emissions Laboratory which demonstrated that the specified rocker arms do not have any adverse effect on the exhaust emissions of the affected vehicles. Based on the submitted information, results of the emission tests performed at Crane Emissions Laboratory, and an engineering evaluation, the staff concludes that the installation of Crane Cams rocker arms will not adversely affect exhaust emissions on the specified vehicles. The staff recommends Crane Cams, Inc. be granted an exemption as requested and that Executive Order D—22§—1 be issued.

Page Number SUMMARY CONTENTS i1 I. INTRODUCTION II. CONCLUSION III. RECOMMENDATION IV. ROCKER . ARM DESCRIPTION DISCUSSION OF THE ROCKER ARMS APPENDIX A — Associated parts list APPENDIX B — Installation instructions 10 1i

EVALUATION OF CRANE CAMS, INC. ROCKER ARMS EXEMPTION FROM THE PROHIBITIONS OF VEHICLE CODE SECTION 27156 IN ACCORDANCE WITH SECTION 2222, TITLE 13, OF THE CALIFORNIA CODE OF REGULATIQONS I. INTIRODUCTION Crane Cams, Inc. of 530 Fentress Blvd., Daytona Beach, Florida 32114, has‘ applied for an exemption from the prohibitions of Vehicle Code Section 27156 for their rocker arms for installation on 1991 and older General Motors vehicles. Crane Cams has submitted a completed application and all the required information, as well as e}haust emissions test data performed at Crane Emissions Laboratory which demonstrated that the specified rocker arms do not have any adverse effect on the exhaust emissions of the affected vehicles. II. CONCLUSIONS Based on the submitted information, results of the emission tests performed at Crane Emissions Laboratory, and an engineering evaluation, the staff concludes that the Crane Cams, Inc. rocker arms will not adversely affect exhaust emissions from vehicles for which the exemption is requested. III. RECOMMENDATION The staff recommends that Crane Cams, Inc. be granted an exemption as requested and that Executive Order D—225—1 be issued. IV. ROCKERARMSDESCRIPTION The rocker arms are specifically designed for installation on 1991 and older General Motors vehicles powered by 262 CID (4.2L} to 454 CID (7.4L) V—8 gasoline engines. The rocker arms operate in conjunction with the original equipment manufacturer‘s (QEM) emission control systems already

certified with the stock engines. The purpose of using the modified rocker arms is to increase the overall engine performance by modifying the valve characteristics. The applicant claims the device uses proprietary materials, clearances, geometry and heat treatment to achieve improvements in the engine performance. The Crane Cams rocker arm is designed to increase the rocker arm ratio of the small block GM V—8 gasoline engines with 262 to 400 CID engine sizes from a 1.5:1 to 1.6:1. For GM V—8 engines with 396 to 454 CID engine sizes, stock rocker arm ratio is increased from 1.7:1 to 1.8:1. Rocker arm part numbers for the appropriate engine sizes are shown in appendix A. The installation instructions for the device is shown in Appendix B. V. DISCUSSIONOFTHEROCKERARMS Crane Cams submitted comparative emission testing conducted at Crane Emissions Laboratory. A 1984 federally—certified Chevrolet Camaro powered by a 305 CID engine was used as the test vehicle for the rocker arms. To calibrate the Camaro to California specifications, Crane Cams changed the prom based on documentation given to Crane Cams by General Motors. This calibration change was verified and accepted by the ARB when Crane Cams was testing for their Compucam 2000 camshaft for the same GM application. The dynamometer inertia weight and loading used during the testing were 3625 lbs. and 7.8 hp, respectively. Comparative emission testing consisted of cold—start CVS—75 Federal Test Procedure in the baseline and modified configurations. The test results are shown in Table 1.

Table 1 CVS—75 TEST RESULTS {Crane Emissions Laboratory) Test Exhaust Emissions (gm/mi} Mode HC CQ XKQx BaseTine 0.37 5.48 0.64 1.6 rocker arms 0.31 5.38 0.71 Difference ~0.06 —0.10 0.07 The CVS—75 emissions test results at Crane Emissions Laboratory indicate that HC, CO and NOx emissions of the rocker arms to be within the limits specified in the procedures for exemption. This demonstrates that the installation of the increase ratio rocker arms for all 1991 and older General Motors 267 CID (4.4L) to 454 CID (7.4) V—8 gasoline engines will not adversely affect the exhaust emissions. The ARB did not conduct confirmatory tests to validate the emission test results submitted by Crane Cams. ~However, an engineering analysis was performed comparing the rocker arm‘s increase in the valve lift to that of the Compucam 2000 series camshaft. Crane Cam‘s Compucam 2000 series has previously been tested at the Haagen—Smit Laboratory using the same test vehicle (1984 Chevrolet Camaro) and was found to have no adverse effect on emissions. The camshaft when compared to QEM, increased the intake valve lift by 20.31 percent and the exhaust valve lift by 15.97 percent (see Table 2).

Table 2 Sample calculations as related to GM 5.0 liter gasoline engine. Maximum camshaft intake lobe height in stock Configurati®n —————~——~————cceccesececcc}~ 2344 of an inch Maximum camshaft intake lobe height in modified COAfigUPAtiION ~—————————cecceccecce~e~> .282 of an inch Maximum camshaft exhaust lobe height in stock configuration ~——~——————————e—ceccom—cce—~ 2561 of an inch Maximum camshaft exhaust lobe height . in modified COnfigurati0n <—————~——g———c——~ecc=—c——~— .297 of an inch StOCK POCK@P® Patip —————«——=——<—co—comeccccoccese== 1.5 to 1 Crane rOCker arM ratio ———~—————=———eccceccucc=—=—~ 1.6 to 1 Valve lift = lobe height x rocker arm ratio Intake Specificati RockerArm 0.2344 x 1.5 0.3516 valve lift in stock configuration 0.2344 x 1.6 0.3750 valve lift in modified configuration intake difference = 0.0234 of an inch or a 6.67 percent difference Modif ied Camshaft 0.282 x 1.5 = 0.423 valve lift in modified configuration intake difference = 0.0714 of an inch or a 20.31 percent difference Ext specificati Rocker_Arm 0.2561 x 1.5 0.3842 valve lift in stock configuration 0.2561 x 1.6 = 0.4098 valve lift in modified configuration intake difference = 0.0256 of an inch or a 6.67 percent difference Modified Camshaft 0.297 x 1.5 = 0.4455 valve lift in modified configuration intake difference = 0.0614 of an inch or a 15.97 percent difference _4

In a comparison, the rocker arms increased the intake valve lift and exhaust valve lift by only 6.67 percent over the QEM. Since previous testing showed that a 20.31 percent increase in the intake valve lift and a 15.97 percent increase in the exhaust valve lift do not cause a significant increase in vehifile emissions, staff concludes that Crane Cam‘s rocker arms which increase the valve lifts by a much smaller percentage will not adversely affect emission of applicable vehicles. ‘ Crane Cams has submitted all the required information and fulfilled the requirements for an exemption. The test results and engingering evaluation confirmed that Crane Cams rocker arms meet the requirements for the exemption.

APPENDIX A

Energizer Aluminum Rocker Arms APPLIGCATION PART_NG. Chevrolet V8, 262—400 cu. in. 1.6 Ratio, 3/8 stud (for press—in Studs) <———————————————c—————— 3005 1.6 Ratio, 3/8 Stud «——————_————ouececccecceecomecosscsecssec——= 3002 1.6 RatiG, 7/16 Stuid o——_e—ceccoeccccceccceccccccecccamccsceaces 3003 "Super Blue" Extruded Aluminum APPLICATION PART_NO. Chevrolet Y8, 262—400 cu. in. . 1.6 Ratio, 7/16 Stud ———————————ocecuccecceccucemeccecemechecec~ 3051 Hi Intensity Rocker Arms APPLICATION PARTNO. Chevrolet V8, 262—400 cu. in. 1.6 Ratio, 3/8 $Stud ——————cc——coecoececcecomecccmencucsensecece~ 11746—16 1.6 Ratio, 7/16 Stud —————————eccocceccecuccmcuaccaccemenacecce—~ 11747—16 Pedestal Mount Rocker Arms APPLICATION PARTNO. Chevrolet V8, 262—400 cu. in. 1.6 Rati0 Intake OffSELt L@ft —————————ececowecomcucmensnecsences 11734L—1 1.6 Ratio Intake Offset Right ————————e—o—eccecececcceccoacecece~, 11734R—1 1.55 Ratio Exhaust Offset L@ft ———————ccececcecececcecmcemcecee~ 11737L—1 1.55 Ratio Exhaust OffSet Right —————————————ecoccccoecaeacccees 11737R—1 1.6 Ratio Exhaust Offset Left ~_—_—_—cccccecoccmeccceesceccecee> 11738L—1 1.6 Ratio Exhaust Offset Right ~—————~—————cecuccececsecccucses. 11738R—1

Aluminum Rockers APPLICATION PART_NO.. Chevrolet ¥8, 396—454 cu. in. 65—91 with Dart "Big Chief" cyl. heads 1.75 Ratio Intake Offset Left ——————c—————_c——oeccccemc_asec——=—— 11732L—1 1.75 Ratio Intake Offset Right <—————————=——ee<———e«eccemc——e==—— 11732R—1 1.8 Ratio Intake Offset Left <———————oc——cco—ccceecacececeaecce~ 11733L—1 1.8 Ratio Intake Offset Right —=—————<———————eccecccem—camc——=——— 117338—1 1.8 Ratio EXha@USt ~——————————c———ceco=ecccuceccmeccanecamec—=~~~ 13739—1 Shaft—Mounted Needle Bearing Rocker Arms APPLICATION PART_NO.. Chevrolet V8, 262—400 cu. in. 1.6 Ratio Intake and EXR@UuSt <———————————~_——cccescccsscoscece—~ 84790—1 1.6 Ratio IAt@k@ ———————————«——eccoccccsccemecemecccchncecemcece 84791—1 1.6 Ratio intake, 1.5§ rati0 @Xh@uSt ————————cc———ceccccec_ce—~~ 11790—1 Aluminum Rocker Arms APPLICATION PARTNQ. Chevrolet V8, 262—400 cu. in. 1.6 Ratio 3/8 Stud ————~——ccccocceeceaneccccecececemecceccocec~~ 11759—16 1.6 Ratio 7/16 Stud —————c———cooccceccccccmmenenomemeccunensene~ 11755—16 1.6 Ratio 7/16 Stud ————————omcoccomcccacenccmemencenmecececenee~ 11768TR—16 Variable Ratio (1.5, 1.55,. 1.6), 3/8 Stud ~——————cc—c—_ccuc——__~ 11778—16 Variable Ratio (1.5, 1.65, 1.6), 378 $tud ~———————————=_——_———_—— 11779—16 Variable Ratio (1.5, 1.55, 1.6), 7/16 Stud <————~———————cec—_——~ 11780—16 Variable Ratio (1.5, 1.55, 1.6), 7716 Stud —————————————<———————— 11781—16 1.6 Ratio Left and Right Exhaust, 7/16 stud ——«———————==—=——————— 11770TR—16 1.6 Ratio Left 7/16 Stud ———————c—o—ccecceccccomecececenneccsc=~ 11770L—1 1.6 Ratio Right 7/16 Stud —————————eccoccuccocccscosecccececcce~ 11770R—1

Aluminum Rocker Arms Cont. APPLICATION PART_NO.. Chevrolet V8, 262—400 cu. in. 1.6 Ratio Left 7/16 §tud ~—————————c_—covecccec—eccoeccocccce—e—~ 11766L—1 1.6 Ratio Right 7/16 Stud ————————_———occcomeccemcccaceccecce==~ 11766R—1 1.6 Ratio Left 7/16 §tud ——————————_cco——comeccocccccccoccesecnes 11762L—1 1.6 Ratio Right 7/16 Stud —————————c——~eccoccccceccoccccemeccc—=~ 11762R—1 Aluminum Rocker Arms APPLICATION PART_NO. Chevrolet Y8, 396—4§54 cu. in. . 1.8 Ratio 7/16 $tud —c——————c——coeccccccccecemcccecccesecacecec~~ 13755—16 1.8 Rat10 7/16 $StUd ————o—eccencecececonenccenscemecenesenmanenes 137687R—16

APPENDIX B —10—

Exhibit A cont. Aluminum Rockers APPLIGCATION PART_NO. Chevrolet V8, 396—454 cu. in. 65—91 with Dart "Big Chief" cyl. heads 1.75 Ratio Intake Off§@t L@ft ———————co——e—ccecoccceccczcencesce~ 117321—1 1.75 Ratio Intake Offs@t Right ———~————~——<—ce—ccccocccsceccc=co~ 11732R—1 1.8 Ratio Intake Off§@t Left —~——————_—cecoscecucccccumccccscs—..s 11733L—1 1.8 Ratio Intake Offset Right ————————— ffpininininintataintetsistatetniataintateintatetel 11733R—1 1.8 Rati0 EXRAUSt —————«——ecce—cccesceacomecamcasceccesnaccanee~ 13739—1 Shaft—Mounted Needle Bearing Rocker Arms APPLICATION PARTNO. Chevrolet V8, 262—400 cu. in. 1.6 Ratio Intake @nd EXN@USt ——~——————«———————coeccececccmeccce=~ 84790—1 1.6 Ratio Intake —~————~————————_——«ccosccscomcccccamececenesaec~~ 84791—1 1.6 Ratio intake, 1.55 rati0 @«h@ust ———————————ccccoeccece_c=~~ 11790—1 Aluminum Rocker Arms APPLICATION PARTNO. Chevrolet V8, 262—400 cu. in. 1.6 Ratio 3/8 StUd ——————o——cccoceccmeccececancomemensensecece., 11759—16 1.6 Ratio 7/16 Stud ~————————=——cocu—comccecceccascceccamccece~~ 11755—16 1.6 Ratid 7/16 Stud —<——————————c—c—ccc—scecccecemeeccmcemecanee~ 11768TR—16 VYariable Ratio (1.5, 1.5§, 1.6), 3/8 Stud ——————————eeccececec~~ 11778—16 Variable Ratio (1.5, 1.55, 1.6), 3/8 stud <————————o———e~ccec=———— 11779—16 Variable Ratio (1.5, 1.55, 1.6), 7/16 Stud —————<—————c—=—_————— 11780—16 Variable Ratio (1.5, 1.55, 1.6), 7716 StUd _—ocoe——occcascoccccee~ 11781—16 1.6 Ratio Left and Right Exhaust, 7/16 stud ————————————mc—~———— 11770TR—16 1.6 Ratio Left 7/16 Stud ————————c—c——oecceccomccccccmccmccecce~ 11770L—1 1.6 Ratio Right 7/16 Stud ———————————=—ocecceccoccasccccccecce.~ 11770R—1

Exhibit A Energizer Aluminum Rocker Arms APPLIGCATION PARTNO. Chevrolet Y8, 262—400 cu. in. 1.6 Ratio, 3/8 stud {for press—in studs) ——————————————<———————— 3005 1.6 Ratio, 3/8 Stud ~————————c————ccoceccccecccocccecacemecce~~~, 3002 1.6 Ratio, 7/16 $tUd ——c———occeccccsccccuececcee—maaucnaaama=e== 3003 "Super Blue" Extruded Aluminum APPLICATION PARTNO. Chevrolet V8, 262—400 cu. in. 1.6 Rati0, 7/16 $tU@ ———————=ccocecccomecocowscecanccecenecccees 3051 Hi Intensity Rocker Arms APPLICATION PARTNO. Chevrolet V8, 262—400 cu. in. 1.6 Ratio, 3/8 Stud —————c———w<ccomeccococeccocemeccemsecesce—~~ 11746—16 1.6 Ratio, 7/16 stud onennoncuenonesoncamcessessecsessonenseceess 11747—16 Pedestal Mount Rocker Arms APPLICATION PARTNO. Chevrolet V8, 262—400 cu. in. 1.6 Ratio Intake Off§S@t L@eft —————————=—coceczcceccccececaccccce~ 11734L—1 1.6 Ratio Intake Offs@t Right «———————————e=———=meccccceecc=aa—« 11734R—1 1.55 Ratio Exhaust Offset Left ——————————e————ceccccccecccoccc—~ 11737L—1 1.55 Ratio Exhaust Off§et Right ———<—————=——coceacccccsccccme==~ 11737R—1 1.6 Ratio Exhaust Offset L@ft ———«———————ececeeccecmaseccce_ec~~~ 11738L—1 1.6 Ratio EXhaust Offs@t Right ——————————————ececcccecccccecen~~ 11738R—1

Form No. 329E READ CGMPLETELY w BEFORE INSTALLINGI * ROCKER ARM PARTNUMBERAS11744,11745,11746and if you have any questions regarding these installation instruc— 11747 are designed for valve springs up to 1.500" diameter tions please contact one of our Crane Cams Technical and a maximum open pressure of 500 pounds. PART NUM— Specialists. (904) 258—6174, Monday through Friday, 8:00 BER 13744 is designed for valve springs up to 1.630" diame— AM to 8:00 PM, Eastern Time. For 24 hour, 7 days—a—week ter and a maximum open pressure of 550 pounds. camshaft and valve train component recommendations con— tact Crane Dial—A—Cam, (904) 258—6174, wait for answer and * IMPORTANT—Changing rocker arm ratios affects piston—i0— press "4" on your touch— tone telephone. valve clearance and can create valve spring coil bind. Higher than standard ratios can also cause pushrods to bind in the cylinder head or quideplate. Recheck these areas to eliminate failures. \ svyEr4 Place the rocker arim on the stud with the flat side of the fulcrum turned up. * We recommend that you install rocker arms on one cylinder at a time and then adjust valvelash for that particular cylinder. Following this procedure will eliminate problems caused by too tight of an adjustment (bent vaives, bent or broken sYEp 2 .ushrods. rocker arm studs, etc.) Check to make sure that the bottom side of the rocker arm does not touch the lower portion of the rocker arm stud or the * Except with ROCKER ARM PART NUMBER 13744, any > stud boss with the lifter on the base circle, or "heel", of the pushrod guideplates used must be either a flat style or one of cam and the pushrod is all the way down. See arrow on Crane Cams new "short step" models. Refer to your Crane Figure 1. Cams Catalog for the correct part number guideplates for your application. Most stepped guideplates are too tall, and will interfere with the rocker arms, therefore binding the vaive train. Part number 13744 will accept most popular types of qguideplates,flat or stepped. Guideplate—to — rocker arm clear— ance must be checked with all quideplates. * Some newer Chevrolet V—8 cylinder heads are factory equipped with "Self Aligning" rocker arms. These rocker arms have a stamped recess on the vaive tip end, to guide the FIGURE NO. 1 rocker arm and position the pushrod in the pushrod guide— plate. NOTE:The stock Chevrolet pushrod quideplates and pushrods ARE NOT HEAT TREATED (hardened), and can— STEIP 3 not be used with Crane rocker arms. To use Crane rocker arms you must replace the guideplates with either the hard— Check the clearance between the underside of the rocker arm ened factory Chevrolet high performance guideplates or Crane and the vaive spring/retainer combination. THIS STEP IS pushrod guideplates. (See Crane Master Catalog) If heat treated pushrod quideplates are used YOU MUST USE HEAT TREATED CRANE CAMS PUSHRODS! Factory—style stamped steel valve covers are used, you may eed to trim away the Inside brace to clear the guideplates. Check this before running the engine! Late model GM factory cast vaive covers may not have sufficient clearance to permit a rocker arm change without grinding the internal bolt support bosses. FIGURE NO. 2

* wiey EXTREMELY IMPORTANTI YOU MUST HAVE A MiNL— there is interference with the rocker arms. Hold the cover MUM OF .040" CLEARANCE IN THE AREAS SHOWN IN down with your hand and turn the engine over with the starter. FiIGURE 2. Normaily, the feast clearance will occur when the DO NOT START THE ENGINE]! If you have interference with valve is closed and the lifter is on the base circle of the cam, the rocker arms you can gain the needed clearancein several you must recheck for clearance throughoutits travel after ways. Minor interference can be corrected by using an extra . adjust the valve lash. UNDER NO CIRCUMSTANCES thick, or double, valve cover gasket or by modifying the inside SHOULD YOU ATTEMPT TO GET ADDITIONAL CLEAR— of the valve cover. Some applications may require use of af— ANCE BY GRINDING OR MODIFYING THE ROCKER ARMS. termarket "taller than stock" valve covers. Additional clearance can be properly obtained by using longer than stock pushrods and/or valve stem lash caps. SYEP 6 Remove the valve cover(s) and pour a bottle of Crane Cams Super Lube 99003—1 over the rocker arms. Install the vaive Valve Adjustment— MAKE SURE THAT THE PUSHROD IS covers using fresh, non—compressed gaskets. Your engine is PROPERLY SEATED IN THE LIFTER AND IN THE ROCKER ARM BEFORE MAKING ADJUSTMENT! FOR HYDRAU— LIC LIFTER CAMS: Turn the engine in the normal direction ofrotation until the exhaustpushrod on the cylinder that you‘re adjusting starts to move UP. Now adjust the INTAKE rocker ‘ SYEP 7 . arm on that cylinder to zero lash with no pre—load... then 1/2 if you have a mechanical or roller tappet cam you should to 1 turn more The rocker arm is adjusted by turning the hex recheck your valve adjustment after a short period of time. nut until you obtain the proper adjustment. Now tighten the * The engine should be—started and allowed to warm up to a setscrew and torque the hex nut to a maximum of 15—20 foot normal operating temperature. Then check the vaive lash pounds. Rotate the engine in the normaldirection of rotation adjustmentfor the proper "hot" setting as per your cam spec until the intake valve that you‘ve now adjusted opens and card. almost closes. REMINDER: EXCESSIVE LASH INCREASES STRESS (The intake pushrod should move slightly more than half way ON THE ENTIRE VALVETRAIN AND WILL down in its travel.) Now adjust the exhaust rocker arm on that INCREASE WEAR AND THE POTENTIAL linder. Set the exhaust rocker arm at zero lash, then 1/2 to OF VALVE TRAIN BREAKAGE. turn more. Tighten the set—screw and torque the hex nut to 15—20 foot pounds. Continue this procedure for each cylin— der, doing one at a time, until all of the rocker arms are NOTE: If you have any questions or need additional adjusted the same. technical assistance, call our Tech Depart— FOR MECHANICAL AND ROLLER TAPPET CAMS: Use ment 904/258—6174. the same basic procedure as above, except instead of pre— loading the lifter, you must set the rocker arm to the proper valve lash spec as shown on your camshaft spec card. Re— SPECIAL INSTRUCTIONS FOR ENGINES EQUIPPED member to recheck your adjustment after the hex nut has WITH NON—ADJUSTABLE ROCKER ARMS (SUCH AS FORD, AMERICAN MOTORS, ETC.) If your engine was originally equipped with "rail type", "ped— estal mount" or "bridge mount" rocker arms (consult your shop STEP 5 manual for specific identification or details), you will need to machine your cylinder heads to accept pushrod quideplates It is necessary to check for proper clearance between the and the proper screw—in rocker arm studs, or utilize one of our rocker arm and the vaive cover, especially around any filler rocker arm conversion kits. The use of metal pushrod guide— cap openings or baffles. Place the vaive cover you plan to use, plates also requires that you must use special heat treat and the gasket you‘ll be using on the head and screw in (two hardened pushrods such as those available from Crane or three threads in is fine) a couple of hold—down bolts to locate Cams. These pushrods are designed for use with guideplates the cover. Leave the bolts loose to allow the cover to move if and will not rapidly wear out as will stock or stock—type, soft pushrods. 530 Fentress Bivd., Daytona Beach, FL 32114 € 1990 CRANE CAMS, INC. Form No. 329E

Form No. 829E w READ COWIPLETELY «& BEFORE INSTALLING! * ROCKER ARMPART NUMBERS 11744,11745,11746 and If you have any questions regarding these installation instruc— 11747 are designed for valve springs up to 1.500" diameter tions please contact one of our Crane Cams Technical and a maximum open pressure of 500 pounds. PART NUM— Specialists. (904) 258—6174, Monday through Friday, 8:00 BER 13744 is designed for valve springs up to 1.630" diame— AM to 8:00 PM, Eastern Time. For 24 hour, 7 days—a—week ter and a maximum open pressure of 550 pounds. camshatft and valve train component recommendations con— , Mact Crane Diat—A—Cam, (904) 258—6174, wait for answer and * IMPORTANT—Changing rocker arm ratios affects piston—to— press "4" on your touch— tone telephone. valve clearance and can create valve spring coil bind. Higher ‘ than standard ratios can also cause pushrods to bind in the cylinder head or guideplate. Recheckthese areas to eliminate > c STIEIP 4 ra ty o« failures. Place the rocker arm on the stud with the flat side of the fuicrum turned up. * We recommend that you install rocker arms on one cylinder at a time and then adjust valvelash for that particular cylinder. re 4 begs any Following this procedure will eliminate problems caused by SYEP 2 too tight of an adjustment (bent valves, bent or broken rods, rocker arm studs, etc.) Check to make sure that the bottom side of the rocker arm does not touch the lower portion of the rocker arm stud or the * Except with ROCKER ARM PART NUMBER 13744, any stud boss with the lifter on the base circle, or "heel", of the pushrod guideplates used must be either a flat style or one of cam and the pushrod is all the way down. See arrow on Crana Cams new "short step" models. Refer to your Crane Figure 1. Cams Catalog for the correct part number guideplates for your application. Most stepped guideplates are too tall, and will interfere with the rocker arms, therelore binding the valve train. Part number 19744 will accept most popular types of guideplates, fiat orstepped. Guideplate—to — rocker arm clear— ance must be checked with all guideplates. * Some newer Chevrolet V—8 cylinder heads are factory equipped with "Self Aligning" rocker arms. These rocker arms have a stamped recess on the vaive tip end, to guide the FIGURE NO. 1 svie rocker arm and position the pushrod in the pushrod guide— plate. NOTE:The stock Chevrolet pushrod guideplates and pushrods ARE NOT HEAT TREATED (hardened), and can— not be used with Crane rocker arms. To use Crane rocker arms you must replace the guideplates with either the hard— Check the clearance between the underside of the rocker arm ened factory Chevrolet high performance guideptates or Crane and the valve spring/retainer combination. THIS STEP IS pushrod quideplates. (See Crane Master Catalog) If heat treated pushrod quidepiates are used YOU MUST USE HEAT TREATED CRANE CAMS PUSHRODS! ctory—style stamped steel valve covers are used, you may 1 to trim away the inside brace to clear the guideplates. Check this before running the engine! Late model GM factory cast valve covers may not have sufficient clearance to permit a rocker arm change without grinding the internal bolt support bosses. FIGURE NO. 2

Exhibit A cont. Aluminum Rocker Arms Cont. APPLICATION PARTNO.. Chevrolet V8, 262—400 cu. in. 1.6 Ratio Left 7/16 StUud ———————————o—ccocec=eccceecoceeneeccec~ 11766L—1 1.6 Ratio Right 7/16 Stud ~—————~—o—cccccoeccccccumenceccece.ce> 11766R—1 1.6 Ratio Left 7/16‘stud --------------------------------------- 11762L—1 1.6 Ratio Right 7/16 Styd <=—————<amccocwcccecccccecemcececcc———— 11762R—1 Aluminum Rocker Arms APPLICATION PART_NO. Chevrolet Y8, 39%6—454 cu. in. 1.8 Ratio 7/16 Stud <————————=——ocee—occccommeeccccomesnecemma—~~, 13755—16 1.8 Ratid® 7/16 StUd —————oo—eeccccoccemeenenccmeccameemamcecene., 13768TR—16


Document Created: 2005-09-01 12:45:27
Document Modified: 2005-09-01 12:45:27

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