Pure Stock Challange - Ohio May 2014

[X-TECH MAN]

Originally Posted by Michael Beard

IHRA Pure Stock rules have been largely unchanged for many years.

Aftermarket camshafts are permitted, but "must check on or under factory specs for lift, duration, and overlap." Transmissions must be stock, unaltered, except for shift kit. Aftermarket converters are allowed.

IHRA Rulebook is available online, see Pure Stock on page 47-48: http://www.mydigitalpublication.com/...tion/?i=136499


donc - thanks for your support! Will send you a PM.

How many tech guys really know HOW to check duration and overlap......LOL. Not only that but the tech specs on most newer cars do NOT even list duration and overlap specs or valve spring pressures.