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12/18/2002

The following Stock/Super Stock horsepower and index changes, produced by the Automatic Horsepower Factoring System (AHFS), were released Dec. 17. This is the third round of scheduled changes for 2002. All changes will be in effect beginning Jan. 1, 2003. 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 from final qualifying at NHRA national events. The data-based format provides 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.

Super Stock Horsepower Changes
Buick	455	250	293	-8	285	1971-72
Buick	455	245	304	-9	295	1974
Chevy	327	250	255	-5	250	1968 (SS only)
Chevy	396	375	395	-5	390	1965-69 (Automatics; SS & GT only)
Chevy	396	375	405	-5	400	1968-69 (Automatics; SS & GT only)
Chevy	427	435	480	-15	465	1967-69
Dodge/Plymouth	318	155	250	-5	245	1978-89 (SS only)
Dodge/Plymouth	426	365	365	-45	320	1964-65
Dodge/Plymouth	426	415	415	-10	405	1964
Dodge/Plymouth	426	425	425	-10	415	1964
Ford/Mercury	302	225	235	-10	225	1987-92
Ford/Mercury	351	266	310	-5	305	1972
Ford/Mercury	351	280	310	-5	305	1971
Ford/Mercury	351	290	290	-30	260	1969
Ford/Mercury	351	300	300	-10	290	1995
Ford/Mercury	390	320	320	-5	315	1966-67
Ford/Mercury	429	370	410	-30	380	1971
Pontiac	400	330	325	-10	315	1968
Pontiac	428	360	350	-30	320	1967-69

Super Stock Index Changes
Class	Old Index	Change	New Index
SS/TD	11.70	-.05	11.65
GT/TD	11.70	-.05	11.65
GT/TA	10.90	-.05	10.85

Stock Horsepower Changes
Make	CID	OEM HP	NHRA HP	HP Adjustment	New HP	Years/Cars Affected
Chevy	262	130	160	-5	155	1985
Chevy	305	145	200	-10	190	1976-79 (Buick, Olds, Pontiac)
Chevy	350	165	240	-10	230	1969-76
Chevy	350	360	355	-30	325	1970
Dodge	318	160	255	-15	240	1980 (Truck only)
Dodge/Plymouth	413	410	410	-15	395	1962
Dodge/Plymouth	413	420	420	-15	405	1962
Dodge/Plymouth	426	365	320	-20	300	1964-65
Ford/Mercury	289	210	210	-5	205	1964
Ford/Mercury	302	143	210	-40	170	1971-82
Ford/Mercury	390	325	325	-10	315	1968
Ford/Mercury	429	370	365	-10	355	1971
Ford/Mercury	429	360	360	-5	355	1971-72
Olds	350	200	275	-25	250	1971-72 (Automatic only)
Pontiac	151	92	120	-7	113	1985-87
Pontiac	400	340	365	-5	360	1968
Pontiac	403	185	285	-5	280	1979
Pontiac	421	405	405	-20	385	1962
Pontiac	455	250	320	-5	315	1972
Pontiac	455	360	355	-5	350	1970

Stock Index Changes
Class	Old Index	Change	New Index
GT/SA	13.95	-.10	13.85
ET/SA	13.20	-.05	13.15
CT/SA	13.05	-.05	13.00
FT/SA	13.65	-.05	13.60
JT/SA	16.80	-.05	16.75
H/TS	14.40	-.05	14.35