Quote:
Originally Posted by THEFERMANATOR
You have to pull the heads off and have them machined to go over .480 lift. Stock lift is about .425 on them, and teh stock spring set-up is good for .450, the crane or comp springs and retainers can get you to about .480 safely, but to go more you have to machine the heads. In stock form the intake is VERY restrictive, and teh heads can use alot of work as well.
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GM makes what they call "hot cams" for all their roller motors that slide in with NO mods according to the cataloge.