What is piston to valve clearance? In a nut shell, it is the clearance between the valve and piston; which is something any one should check for when building an engine. The magic number for a street application is one hundred and twenty thousandths clearance between the valve and piston. Things you’ll need before checking piston to valve clearance is obviously your short block, cylinder head, head gasket, roller rockers, push rods, and a 'dog bone' or lifter retainer. Throw in our special piston to valve clearance kit, digital or dial caliper, and some good old Play-Doh.
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