installed valve spring height on a 454 mag

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05-20-2008, 02:45 PM

lake speed

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installed valve spring height on a 454 mag

I have a set of 990 heads being redone off of my 454 mag and the machine shops needs the installed height of the valve springs. I could also use the recommended seat pressure and the recommended psi of the spring when open. I need this asap! help please.

05-20-2008, 04:35 PM

Griff

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I can you tell you the stock cam specs and they might be able to work off that.

.510/.510 , 220/220, 115 lobe separation.

05-21-2008, 07:01 AM

ezstriper

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about 1.900 should be fine, thats what mild comp cams springs are designed to run at, spring pressure going to be with spring choice at that height...Rob