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The NHRA Stock/Super Stock Committee has reviewed the Automatic Horsepower Factoring System (AHFS) and the written requests from Sportsman racers in its evaluation of specific Stock and Super Stock horsepower and index adjustments. The changes were effective Jan. 1, 2002. The review is part of NHRA's commitment to evaluating requests from the Sportsman racing community and is an important step in NHRA's AHFS.

AHFS basics: Only national event final qualifying data, accumulated from the last time horsepowers were changed, are included in the database; any run of 1.15 seconds or more under the index or .25-second or less under the index automatically triggers a flag for analysis; engine-combination averages and class averages are then computed and analyzed to determine if a change is warranted; if the engine family or class average is 1.00-second or more under the index, an increase is initiated; the amount of change is calculated on a stepped-percentage basis; where applicable, adjustments will be in effect for the specific car model or body style being evaluated.

Further changes are scheduled, to be effective May 20, 2002.

Super Stock Horsepower Changes
Engine Yr/Make	CID	OEM HP	NHRA HP	HP Adjustment	New HP	Years Affected
78 Olds	350	170	259	4	263	1978
77 Olds	350	170	259	4	263	1977-80 (GT only)
80 Olds	307	155	255	3	258	1980 (GT only)
72 Buick	455	250	300	-7	293	1972 (SS & GT)
68 Chevy	327	250	270	-5	265	1968 (GT Automatics only)
62 Chevy	327	300	290	-25	265	1962-67
65 Chevy	327	350	325	-25	300	1965-67
94 Chevy	350	260	295	-20	275	1994-97
00 Chevy	346	345	345	-5	340	2000
71 Chevy	454	425	430	-5	425	1971 (Iron heads only)
71 Chevy	454	425	435	-5	430	1971 (GT, Iron heads only)
69 Ford	428	335	360	-5	355	1969
85 Ford	302	210	230	-8	222	1985 (SS & GT)
71 Ford	351	285	335	-11	324	1971 (SS & GT)
62 Ply/Dodge	383	343	343	-13	330	1962
78 Pontiac	301	150	205	-5	200	1978-79
80 Pontiac	301	140, 155	205	-5	200	1980
81 Pontiac	301	135	205	-5	200	1981
74 Pontiac	350	170, 200	255	-5	250	1974

Stock Horsepower Changes
Engine Yr/Make	CID	OEM HP	NHRA HP	HP Adjustment	New HP	Years Affected
99 Chevy	346	325	324	8	332	1999 (Camaro LS1 only)
99 Pontiac	346	325	324	8	332	1999-01 (Firebird LS1 only)
81 Pontiac	301	200	220	5	225	1981
99 Chevy	346	305	312	4	316	1999-01
99 Pontiac	346	305	312	4	316	1999-01 (Firebird only)
67 Ford	428	355	345	5	350	1967 (Shelby only)
85 Chevy	305	215	238	3	241	1985
86 Pontiac	305	210	238	3	241	1986
73 Ford	351	266	299	4	303	1973 (Mustang only)
93 Ford	302	235	245	3	248	1993-94 (Mustang only)
95 Ford	302	235, 240	245	3	248	1995 (Mustang only)
67 AMC	343	280	280	-5	275	1967-69
86 Chevy	173	120	145	-5	140	1986
86 Cadillac	173	130, 145, 150	150	-10	140	1986
80 Chevy	305	155, 180	235	-5	230	1980-83 (Malibu only)
62 Chevy	327	300	290	-25	265	1962-67
65 Chevy	327	350	325	-25	300	1965-67
00 Chevy	346	345	345	-5	340	2000
65 Chevy	396	325	330	-5	325	1965-69
70 Chevy	402	330	325	-5	320	1970
66 Chevy	427	390	385	-5	380	1966-69
71 Chevy	454	365	370	-5	365	1971-72
83 Dodge	135	94	110	-3	107	1983
92 Dodge	318	220	255	-5	250	1992-01 (Truck only)
71 Ford	351	285	315	-5	310	1971
71 Ford	429	375	370	-5	365	1971
71 Ford	429	375	380	-15	365	1971
71 Ford	429	370	375	-10	365	1971
77 Olds	350	170	255	-5	250	1977-80
78 Ply/Dodge	318	155, 160	255	-5	250	1978-80
81 Ply/Dodge	318	170	255	-5	250	1981-82
83 Ply/Dodge	318	165	255	-5	250	1983-84
85 Ply/Dodge	318	175	255	-5	250	1985, 1988-89
86 Ply/Dodge	318	177	255	-5	250	1986-87
62 Ply/Dodge	383	343	343	-13	330	1962
78 Plymouth	105	63, 54 70, 75	87	-3	84	1978-82
78 Pontiac	301	150	205	-5	200	1978-79
80 Pontiac	301	140, 155	205	-5	200	1980
81 Pontiac	301	135	205	-5	200	1981
73 Pontiac	350	150, 155, 170, 175	214	-4	210	1973-74
69 Pontiac	350	325, 330	350	-25	325	1969
69 Pontiac	400	330	350	-10	340	1969
72 Pontiac	455	250	325	-5	320	1972
71 Pontiac	455	335	350	-10	340	1971

Super Stock Index changes
Class	Change	New Index
SS/DS	-0.15	11.65
GT/TD	-0.05	11.7
SS/CS	0.05	10.6
SS/TA	0.05	10.2
SS/TB	0.05	10.25

Stock Index changes
Class	Change	New Index
DT/S	-0.1	12.95
ET/SA	-0.05	13.3
GF/S	0.05	16.7
GF/SA	0.05	17.15
W/S	0.1	16.5