Approval Details

Valid E.O.

Validity

This Executive Order approved the specified parts on on October 27, 2004.
As of Monday, January 20th, 2025 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModels
1510, 1520, 1530, 1540, 1550, 152005 and older General Motors vehicles equipped with a 4.8, 5.3, 5.7, or 6.0L small block dedicated gasoline V8 engine, excluding the following engine test groups certified to Low Emission Vehicle II (LEV II) emission standards and Super Ultra Low Emission Vehicle (SULEV) emission standards: 2004 model year, 4GMXT06.0187, 4GMXA06.0189; 2005 model year, 5GMXA6.0189, and 5GMXT06.0187.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-250-4
  • Executive Order 250-4 / D250-4
  • ARB # D-250-4
  • Executive Order No: D-250-4
  • C.A.R.B. No. D-250-4
  • Resolution D-250-4
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-250-4 PDF

D-250-4 Document:

CARB_D-250-4

State of California AIR RESOURCES BOARD EXECUTIVE ORDER D—250—4 Relating to Exemptions Under Section 27156 of the Vehicle Code 7 AIRFLOW RESEARCH, INC. SMALL BLOCK CHEVY LS1 GEN 3 ALUMINUM CYLINDER HEADS 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 Section 39515 and Section 39516 of the Health and Safety Code and Executive Order G—02—003; IT IS ORDERED AND RESOLVED: That the installation of the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads, manufactured and marketed by Airflow Research, Inc.,10490 llex Avenue, Pacoima, California 91331 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 2005 and older General Motors vehicles equipped with a 4.8, 5.3, 5.7, or 6.0L small block dedicated gasoline V8 engine, excluding the following engine test groups certified to Low Emission Vehicle II (LEV II) emission standards and Super Ultra Low Emission Vehicle (SULEV) emission standards: 2004 model year, 4GMXTO6.0187, 4GMXAO06.0189; 2005 model year, 5GMXA6.0189, and 5GMXTO6.0187. Part No. Intake Port Volume Chamber Volume Valve Size . Intake/Exhaust 1510, 1520 2050c 66cc 2.02"/1.6" 1530, 1540 205cc 76cc 2.02"/1.6" 1550, 1560 200cc 64c 2.02"/1.6" 1570, 1580 200cc 74cc 2.02"/1.6" 1550—1, 1560—1 200cc 6b6cc 2.02"/1.6" 1570—1, 1580—1 200cc 76c 2.02"/1.6" 1610, 1620 225cC . 66c 2.08"/1.6" 1630, 1640 225cC 76ce 2.08"/1.6" 1650, 1660 220cC 64ce 2.08"/1.6" 1670, 1680 220cc 74cc 2.08"/1.6" 1650—1, 1660—1 _ 220cC 6b6cc 2.08"/1.6" 1670—1, 1680—1 220cc 76c 2.08"/1.6" This Executive Order is valid provided the installation instructions for the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads will not recommend tuning the vehicle to specifications different from those of the vehicle manufacturer. Changes made to the design or operating conditions of the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads, as exempt by the Air Resources Board, which adversely affect the performance of the vehicle‘s pollution control system shall invalidate this Executive Order.

7. Marketing of the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads using any identification other than that shown in this Executive Order or marketing of the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads 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 the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads 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 the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads may have on any warranty either expressed or implied by the vehicle manufacturer. This Executive Order is granted based on submitted emissions test data which showed that the worst case cylinder head, part no.. 1630, did not adversely affect tailpipe emissions during a Cold—Start CVS—75 Federal Test Procedure (FTP) and the Supplemental Federal Test Procedure (SFTP USO6) test cycles. A 2002 Chevrolet Corvette Z06 certified to the Low Emission Vehicle (LEV) emission standards was used as the test vehicle. Results are in grams per mile with deterioration factors (dfs) added to CVS—75 FTP results. Emission levels of the modified vehicle met the applicable emission standards. CVS—FTP USO6 NMOG CO NOX HCHO NMHC+NOx CO Stock . 0.075 3.4 0.2 0.015 0.14° 8.0 Device w/dfs 0.04 112 0.05 0.001 0.04 1.0 This Executive Order is also based on the On—Board Diagnostic II (OBD II) tests conducted on the same test vehicle. Test data showed that the Small Block Chevy LS1 Gen 3 Aluminum Cylinder Heads when installed on the vehicle did not affect the vehicle‘s ability to perform its OBD II monitoring. ' The ARB reserves the right in the future to review this Executive Order and the exemption provided herein to assure that the exempted add—on or modified part continues to meet the standards and procedures of Title 13, California Code of Regulations, Section 2222, et seq. THIS EXECUTIVE ORDER DOES NOT CONSTITUTE A CERTIFICATION, ACCREDITATION, APPROVAL, OR ANY OTHER TYPE OF ENDORSEMENT BY THE AIR RESOURCES BOARD OF ANY CLAIMS OF THE APPLICANT CONCERNING ANTI—POLLUTION BENEFITS OR ANY ALLEGED BENEFITS OF AIRFLOW RESEARCH, INC.‘S SMALL BLOCK CHEVY LS1 GEN 3 ALUMINUM CYLINDER HEADS. 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. AIRFLOW RESEARCH—CHEVY LS1 GEN 3 ALUMINUM CYLINDER HEADS—D—250—4

ols Violation of any of the above conditionsshall be grounds for revocation of this order. The — order may be revoked only after a 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. Executed at El Monte, California, this éz Th day of October 2004. | Klle'nk?ons. Chief Mobile Source Operations Division AIRFLOW RESEARCH—CHEVY LS1 GEN 3 ALUMINUM CYLINDER HEADS—D—250—4


Document Created: 2005-09-01 12:41:01
Document Modified: 2005-09-01 12:41:01

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