Need Help From '72-'73 Racers

[oldskool]

Originally Posted by Dave Noll

There is currently 3 rulebooks from 1972, 1 from 1971 & 1 from 1973 for sale on E-bay.

Thanks !

But I don't need a rule book.

I'm trying to locate an NHRA publication entitled "Factor Finder". They were supposedly published in '72 & '73. Had the NHRA horsepower factors for different engines.

Have never seen one. Only recently heard of their existence.

"...Refactoring of engine horsepower by NHRA actually started as early as the 60's but it was kept a secret for whatever reason until they published a book called the "Factor Finder" in 1972 followed by an updated version in 1973..."

"...there were engines that were refactored but until 1972 those refactored horsepowers were known to only a few.

In 1972 NHRA came out with a book called the Factor Finder. That book gave all the re-factored horsepowers higher than what the manufacturer listed. Quoting from the Factor Finder book....."The 'factoring' system was developed by NHRA, defining separate performance ratings for use in lieu of manufactures' advertised horsepower listings on many cars in competition". 1972 and 1973 saw the Factor Finder books printed, then followed by putting the refactored horsepower in the Classguide below each engine column..."

OR, if someone has all the NHRA Pontiac hp factors for the '71, '72, '73, & '74 seasons, that would be great.