One of the things that make NASCAR engines survive and run 9,000 rpm's is the same cam lift, and lighter spring seat pressure, with them running anywhere from 1.8 to 2.1 rocker ratios. Ofcourse we can't use those kinds of rocker ratio's due to the heads design used in drag racing, we couldn't find a way to get the push rods thru the heads.
JMO
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