Quote:
Originally Posted by Steve Stickel
From the 2014 IHRA Rule Book... Pure Stock lost a little "Purity" today .. This is posted for the guys who might have a cam on order or will be soon..
12/10/13
p. 48 Pure Stock: Camshaft: Camshaft must retain stock lift for horsepower claimed per IHRA Technical Bulletins. OEM duration and overlap is optional
Can't get too crazy as the valve springs still have to check at OEM pressures, open and closed. Guess this was changed to speed up tech / tear down or maybe lack of data supplied by the OEM's?
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Wow! Thanks for posting that. Thanks also to IHRA for changing this a few months after I had Bullet grind a Pure Stock cam with STOCK duration. I could have really went fast if I wasn't restricted to that. Ugh!
