Measure the gasket before you install it permanently and add the difference to the piston to valve clearance. All head gasket manufacturers can tell you the compressed thickness of their gasket. It is not necessary to torque the head yet. 3) Reinstall the cylinder head with the head gasket that is going to be used.Applying a small amount of oil to the clay will prevent it from sticking to the valves as they press into it. The strip should be long enough to run across both the intake and exhaust valve reliefs. 2)Ěpply a strip of model clay 3/8” to ½” wide approximately ¼” thick to the pistons.The cleaner the piston, the better the clay will stick to it. Clean the combustion chamber and the top of the piston and valve reliefs. 1) With the camshaft installed, remove the cylinder head from the block.The position of the cam in the engine will greatly affect piston to valve clearance. Note: Be sure to check piston-to-valve clearance after the cam has been degreed. 030” to these suggested clearance figures, as they stretch and expand more than steel rods. If aluminum rods are being used, add a minimum of.
On the exhaust side, you need 2 to 2 ½ times the clearance you have on the intake. 010”-.015” for piston rock (pivoting in the bore wall). Note: Engine builders have found that all you need on the intake side is the total amount of deck clearance plus. You must then decide whether to fly cut the piston or exchange the cam for a profile that fits into your engine. If there is any resistance during rotation of the crankshaft, STOP! The piston has probably hit the valve. The easiest and most accurate way is to place strips of modeling clay on top of one piston, and then rotate the engine over by hand with the cylinder head bolted in place and all valve train components adjusted. RHS® strongly urges you to check piston-to-valve clearance on larger street cams and all race cams.
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