Quote:
Originally Posted by Woodro Josey
So Myron, what have they(IHRA) done on the Crate motor engines about establishing runner volumes?
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Woodro,
As far as the Mopar combos, many, but not all, of the accepted crate motor heads are also used in OEM applications that NHRA and IHRA should have specs for, including runner volumes for SS. So IHRA should use whatever Stock volumes NHRA comes up with. I don't know what GM or Ford crate motor heads can also be found in OEM production cars. I run the 360/300hp Commando (shaft mounted rockers) which IHRA allows any production 340 or 360 head which was originally available with 1.88" intakes. The original crate motors came with 308 production heads and later Mopar had 576 heads as over-the-counter replacements. But the 576 heads were discontinued several years ago. I believe any of the same heads with 2.02" valves installed, as well as the original 894 X-heads, are legal on the 360/360hp version.
But we'll just have to wait and see what NHRA comes up with and if IHRA will adopt the findings. Like in NHRA, IHRA has been making judgement calls on their Stock heads.