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After extensive research by the Stock/Super Stock committee and as a result of the input from racers, the following factored horsepower changes have been announced by the NHRA.

Stock & Super Stock HP Factor Changes
Effective September 24, 2001

STOCK
MANF	YEARS	CI	ADV HP	OLD HP	NEW HP
Buick	72-74	350	175,190,195	270	260
Chev	1994	207	160	200	170
Chev	67-69	302	290	310	305
Chev	68-73	307	130	200	195
Chev	1968	327	250	250	245
Chev	66-68	327	275	275	270
Chev	1969	350	250	245	240
Chev	1970	402	330	325	320
Chry	78-82	105	63,65,70,75	90	87
Chry	84-87	135	96	110	107
Chry	65-67	273	235	235	230
Chry	63-67	383	280,315,325,330	310	300
Chry	68-71	383	300,330	310	305
Chry	68-70	383	335	320	310
Chry	68-71	440	370,375	365	356
Ford	83-85	302	140,165,175,210	210	205
Ford	64-66	352	250	260	250
Olds	66-69	400	350	350	340
Olds	66-69	400	360	360	350
Olds	68-70	455	390	390	380
Olds	1969	455	380	390	380
Olds	1972	455	270	345	335
Pont	81-84	173	103,107,108,110,112	135	130
Pont	1977	350	170	255	250
Pont	1968	400	330	330	325
Pont	68-69	400	350	350	325
Pont	1970	455	360	360	355
SUPER STOCK
AMC	67-69	343	280	275	270
AMC	1969	390	340	420	415
Buick	1974	455	245	315	304
Chev	1994	207	160	200	170
Chev	55-56	265	180	205	200
Chev	68-73	307	130	200	195
Chev	1970	402	330	365	360
Chry	63-67	383	280,315,325,330	320	310
Chry	68-71	383	300,330	315	310
Chry	68-70	383	335	320	310
Chry	1966	426	425	455	450
Chry	68-71	440	370,375	365	356
Chry	69-71	440	385,390	390	385
Ford	87-93	302	155,200,205,225	240	235
Ford	64-66	352	250	260	250
Olds	66-69	400	350	350	340
Olds	66-69	400	360	360	350
Olds	68-70	455	390	390	380
Pont	81-84	173	103,107,108,110,112	135	130
Pont	1977	350	170	255	250
Pont	1968	400	330	330	325
Pont	1970	455	360	360	355