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Is there a way to check piston to valve clearance without taking my heads off. I am installing 1.6 ratio rockers that will increase my lift to .508, .512 in a small block.
Thanks
Preston
1967 Chevelle
1999 Ford Lightning #1317
 

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One simple way would be to pull the spark plugs. Remove a valve cover (driver's side). Then bring the motor over by hand until #1 exhaust just starts to open. Remove the intake rocker and replace with the 1.6 rocker. Put .100-.150" worth of feeler gauges, shims, etc between the valve stem and the rocker arm. Tighten the rocker to "0" lash. Turn the motor over BY HAND slowly. If there is any resistance STOP! Usually you will find no problems and you know you have AT LEAST .100-.150" of valve clearance (if those are the shims you used). This is plenty for any motor. You can run less clearance but I like at least .100". Check intake and exhaust the same way.

Jody
 

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Neat trick, Jody!! Just make sure the lifter is pumped up if it's hydraulic, no problem if it's solid.
 

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How do you pump up a hydraulic lifter for such a test?
 

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You can't, all you can do is make sure it isn't collapsing. Maybe that's how I should have worded it.
 
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