Maximum Valve Spring Pressure
What is the safest / maximum spring pressure one can run in a SBC with press-in studs?
Thanks Manny |
Re: Maximum Valve Spring Pressure
They tend to pull out or break with the stock springs.
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Re: Maximum Valve Spring Pressure
"They tend to pull out or break with the stock springs"
Under what kind of conditions does this occur in? above or under 6500? over 300 lbs open pressure? |
Re: Maximum Valve Spring Pressure
Problems occur with stock rocker arms if they pinch the stud at full lift, shorter pushrods may help, we used to run stock Z28 springs.---Trevor
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Re: Maximum Valve Spring Pressure
Paul,
Thanks for the info. My plans are to use a set of stock 441 heads 1.94 - 1.50 (press in stud) with z28 springs and aftermarket roller tip or full roller rockers. For some limited street time and some bracket racing. The camshaft will be in the ballpark of 327 / 350 hp cam or something similar below Camshaft Lift: .450 Intake /.460 Exhaust Flat Tappet Duration @ .050" (222°Int/222° Exh) |
Re: Maximum Valve Spring Pressure
Some heads might be fine but there is an inconsistency from head to head and stud to stud. If the heads have a good history a slight step up from stock should be OK
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Re: Maximum Valve Spring Pressure
i've had the studs "pinned" before, might be an alternative for ya...
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Re: Maximum Valve Spring Pressure
You're not going to break studs with that cam/spring combination, and you shouldn't be pulling studs either. If you want a guarantee, drill the stud bosses with a 1/8" bit and install hardened roll pins, or have a shop pull the studs and tap them for repair studs. (shoulderless studs)
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