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Kegracing · 07-17-2011, 09:23 PM

About the same as all stock... you can change duration, but not exceed the spec on lift. Valve spring rules are about the same as all other also, cant change size from stock, but can increase pressure.
IHRA let's you run roller rocker arms on all motors, traditional and crate.
Hope this helps.
Ken

07-17-2011, 09:23 PM	#2
Kegracing Member Join Date: Jun 2002 Location: Red Oak, TX Posts: 441 Likes: 0 Liked 0 Times in 0 Posts	Re: IHRA Crate Motor Stock About the same as all stock... you can change duration, but not exceed the spec on lift. Valve spring rules are about the same as all other also, cant change size from stock, but can increase pressure. IHRA let's you run roller rocker arms on all motors, traditional and crate. Hope this helps. Ken