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Old 01-18-2012, 10:56 AM
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valve to piston clearance

I have a Small Block Chevy and would like to know what the acceptable piston to valve clearance should be. I'm using a Hydraulic Cam with a .512 lift

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Old 01-18-2012, 11:11 AM
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Quote:
Originally Posted by hi railer
I have a Small Block Chevy and would like to know what the acceptable piston to valve clearance should be. I'm using a Hydraulic Cam with a .512 lift
I think I remember hearing like .080" on the intake and .100" on the exhaust. Not 100% sure but it should be around those figures. the more the better lol
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Old 01-18-2012, 11:27 AM
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Scroll down on this page to....
"WHAT IS THE V/P SAFETY MARGIN?"
http://www.iskycams.com/camshaft.php
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Old 01-18-2012, 02:47 PM
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[QUOTE=zildjian4life218]I think I remember hearing like .080" on the intake and .100" on the exhaust. Not 100% sure but it should be around those figures. the more the better lol[
/QUOTE]
Thanks you were right on the Money according to an Isky Rep
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Old 01-18-2012, 03:02 PM
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Originally Posted by hi railer
Thanks you were right on the Money according to an Isky Rep
I just helped my machinist check his clearance a couple weeks ago so It was still fresh in my memory lol.
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Old 01-18-2012, 07:01 PM
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You can go a lot tighter than that if your valvetrain is built with quality matched components. Having it set at .080" intake and .100" exhaust is very safe and will take into account an overrev or 2 and a flexing pushrod, or marginal springs. The most important part is the valve spring. Make sure you run the spring intended for the camshaft you have, and make sure it is installed at the proper height so it can do its job.
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