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The following Stock / Super Stock horsepower and index changes, produced by the Automatic Horsepower Factoring System (AHFS), were announced Aug. 14. This is the second "round" of scheduled changes for 2001. All changes take effect on August 27, 2001, just prior to the Mac Tools U.S. Nationals at Indianapolis Raceway Park. It should be noted that theses changes include ONLY results of the Automatic Horsepower Factoring System. Letters, requests, etc. for horsepower reductions are still being reviewed, and any results will be posted within the next 10 days.

To recap the system basics: Only national event final qualifying data is included in the database. (Only those runs accumulated since the last horsepower change are used for any engine that has received a change.) Any run of 1.15 seconds or more under index, or .25 seconds or less under index, automatically triggers a flag for analysis. Engine combination averages and class averages are then computed and analyzed to determine if any change is warranted. If the engine family or class average is 1.00 second or more under the index, an increase is initiated. If the engine family or class average is .50 seconds or less under the index, a decrease is initiated. 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.

"We received a pretty positive response to the first round of changes back in May," said Director of Sportsman Racing and Member Tracks Len Imbrogno. "Of course, no one is happy to get horsepower, but with this system, everyone sees where the changes come from."

All changes are effective Monday, August 27, 2001. (stats updated 08/16/01)

Stock Eliminator Horsepower Changes:
Engine Yr/Make	CID	HP	OEM HP	NHRA Under	Percent Change	New HP	Years Affected
64 Chev	283	220	220	1.25	1.25%	223	64-66 (stick only)
67 Ford	390	320	315	1.235	1.25%	319	66-67 (315/320 hp)
85 Chev	305	215	235	1.183	1.25%	238	1985
86 Pont	305	210	235	1.183	1.25%	238	1986
70 Ply/Dodge	440	375	365	0.195	2.50%	356	68-71 (All bodies)

Super Stock Eliminator Horsepower Changes:
Engine Yr/Make	CID	HP	OEM HP	NHRA Under	Percent Change	New HP	Years Affected
68 Chev	327	250	270	1.22	1.25%	274	1968 (GT stick only)
68 Chev	302	290	305	0.13	3.25%	295	67-69 (SS and GT)
74 Dod/Ply	360	245	285	0.21	2.50%	278	1974 (SS only)
74 Buick	455	245	315	0.21	3.50%	304	1974 (SS and GT)

Super Stock Eliminator Index Changes:
Class	Current Index	New Index
SS/TD	11.75	11.7
GT/TB	11.2	11.15
SS/CS	10.5	10.55