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Old 07-22-2008, 01:33 PM
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Originally Posted by 454C10
only takes a few minutes to check. But I would think the springs would have a very good chance to have the right install height.

I bet the stock holley springs may even be good enough. Check with holley's website and see what their stock spring pressure is and how much lift they can handle. Going a little light on the spring is better than going too stiff (especially for the break in)

I think the holley heads would make much more power than your old GM heads.
Yea, the Holley springs are a little TOO good enough, lol. They're good for .600" lift and are duals. They're so stiff, I can't even get them off with my (hand tool) spring compresser. Wanna swap them out for the Comp springs... don't wanna tempt fate with the break-in.

Will check piston-to-valve clearance using the Holley springs and, if that checks-out, I'll order a set of Comp springs/locks/retainers and keep my fingers crossed that the installed height works out OK right off the bat.

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