Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Check my valve spring specs for cam break in
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Old 06-21-2013, 10:10 AM
RyanR RyanR is offline
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Originally Posted by cobalt327 View Post
The open spring pressure is 310 pounds- but at 0.575" lift. The pressure at close to 0.500 is going to be well under 300 pounds.

I have broken in FT cams w/springs similar to this- but that was then and this is now. I believe if you're careful and follow all the rules, you'll be OK. But then, I won't be repairing it if it goes wrong.
So I called my semi local builder that does wonderful head work and he walked me through a formula over the phone to calcuate spring pressure for my setup.

(.505 x 310 = 156.5) + 115 = 271 #'s of spring pressure. He says I'll be fine doing the proper break in steps but absolutely nothing wrong with playing it double safe either. So I guess I need to decide which I'm gonna do. Decisions decisions
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