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Before assembling all of the rods and pistons, McAfee mocked up one and bolted it on the crank to check piston-to-valve clearance with our Dart Pro-1 heads. Ours was a little tight on the exhaust side (McAfee likes to see .110-inch clearance at max lift on the exhaust and .050 on the intake unloaded), which left us the choice of fly cutting the pistons or retarding the camshaft 2 degrees. We determined that retarding the cam wouldn’t free up enough clearance, and for the best power, we decided to leave the camshaft timing alone and take a little material out of the intake pocket of the pistons. View Related Article
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