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06-19-2008, 09:05 AM
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Valve Spring Question
Hey Guys,
I'm replacing the valve springs in a 327 and I am wondering if it is really necessary. I have changed the cam from a 7102 Edelbrock to a 255H Comp. The existing springs (Edelbrock P/N 5703) are listed as having a seat pressure of 104-116 lbs, and the new springs (Comp P/N 981-16) are listed as having a seat pressure of 105 lbs. The existing springs have very low run time on them and I was wondering: do they really need to be swapped out? How critical is the possible 11 lbs difference in seat pressure? Thanks, TR 
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06-19-2008, 09:09 AM
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What is the compressed pressure at the lift your cam has? If they are pretty close then I would say just leave em in there.
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06-19-2008, 09:32 AM
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The #5703 Edelbrock springs open pressure is 330 lbs @ 1.180 and the #981 Comp springs open pressure is 273 lbs @ 1.250. 57 lbs sounds like a big difference. In reality, is that enough to cook the face of a new cam or squash a lifter?
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06-19-2008, 09:50 AM
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According to my Comp catalog the Comp 981 measure 316# @1.200", if compressed .020" more they would be the same as the Edelbrocks, should work fine.
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