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The following Stock/Super Stock horsepower and index changes, produced by the Automatic Horsepower Factoring System (AHFS), were released Aug. 19. This is the second round of scheduled changes for 2002. All changes will be in effect Aug. 26, prior to the Mac Tools U.S. Nationals in Indianapolis. 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.

Stock Horsepower Changes
Engine Yr/Make	CID	OEM HP	NHRA HP	HP Adjustment	New HP	Years Affected
Chevy	262	180	185	+3	188	1995
Chevy	346	305-310	316	+4	320	1999-2001
Chevy	346	320	332	+5	337	1999
Dodge	153	150-153	153	+12	165	1989-92
Plymouth	153	150-153	153	+12	165	1989-91
Pontiac	346	305-310	316	+4	320	1999-2002
Pontiac	346	320-325	332	+5	337	1999-2002

Below is a clarification to the '64 Mercury Comet and its horsepower rating that was released earlier with the written requested changes that were effective Aug. 5:

Stock Horsepower Changes
Engine Yr/Make	CID	OEM HP	NHRA HP	HP Adjustment	New HP	Years Affected
Ford	289	210	215	+5	220	1964 Comet