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5/19/2003

The following Stock/Super Stock horsepower and index changes, produced by the Automatic Horsepower Factoring System (AHFS), were released May 19. This is the first round of scheduled changes for 2003. All changes will be in effect prior to the Lucas Oil Route 66 Nationals in Chicago, Ill. It should be noted that these changes include only results produced by the AHFS.

The AHFS is a simple program based on actual run data compiled from all available runs at NHRA national events only. The data-based format provides NHRA the ability to automatically calculate average performances for any class and/or engine combination in Stock and Super Stock. The trigger point for the system is 1.15-second or more and .25-second or less under the respective index. Engine-combination averages and class averages are then computed and analyzed to determine if a change is warranted. The amount of change is calculated on a stepped-percentage basis. Where applicable, adjustments will be effective for the specific car model or body style being evaluated. An automatic adjustment is instituted above the three-time a year process when a 1.50 and under is recorded during any NHRA event.

Any comments, thoughts, or requests need to be received in writing and sent to: National Hot Rod Association; Technical Department; attn: AHFS; P.O. Box 5555, Glendora, CA 91740; or e-mail, AHFS@nhra.com.

Stock Index Changes
Class	Current Index	Change	New Index
CT/SA	13.00	-.10	12.90
DT/SA	13.00	-.05	12.95
FT/SA	13.60	-.10	13.50

Stock Horsepower Changes
Engine	CID	OEM HP	NHRA HP	HP Adjustment	New HP	Years Affected
Buick	403	180-185	280	+4	284	1977-78
Buick	403	175-185	280	+4	284	1979
Chevy	173	125	145	+2	147	1989 (Cavalier)
Chevy	305	145-180	238	+3	241	1980-84 (Camaro)
Chevy	305	190-230	238	+3	241	1987-92 (Camaro)
Chevy	346	305-310	331	+8	339	1999-2002 (Camaro)
Chevy	402	375	385	+5	390	1970
Ford	428	355	385	+5	390	1967 (Shelby)
Ford	390	320-335	319	+4	323	1966-67 (Stick only)
Ford	428	335	380	+9	389	1968-70 (Mustang)
Ford	428	335	380	+5	385	1968-70 (non-Mustang)
Oldsmobile	307	138	210	+3	213	1986-90
Oldsmobile	403	180-185	280	+4	284	1977-78
Oldsmobile	403	175-185	280	+4	284	1979
Pontiac	305	145-180	238	+3	241	1980-84 (Firebird)
Pontiac	305	185-230	238	+3	241	1987-92 (Firebird)
Pontiac	346	305-310	331	+8	339	1999-2002 (Firebird)
Pontiac	403	180-185	280	+4	284	1977-78
Pontiac	403	175-185	280	+4	284	1979

Super Stock Index Changes
Class	Current Index	Change	New Index
SS/AX	10.00	-.10	9.90
GT/JA	11.65	-.05	11.60
GT/TC	11.45	-.05	11.40

Super Stock Horsepower Change
Engine	CID	OEM HP	NHRA HP	HP Adjustment	New HP	Years Affected
Buick	307	140	227	+3	230	1981-88 (GT only)
Chevy	305	215	235	+3	238	1985
Chevy	307	140	227	+3	230	1986-87, 1990 (GT only)
Chevy	327	300	285	+4	289	1962-67 (GT/stick only)
Oldsmobile	307	140	227	+3	230	1983-90 (GT only)
Pontiac	307	140	227	+3	230	1981-89 (GT only)