Chevy 348 Big Block Engine Restoration Safe Exhaust Valve Clearance
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While the 2.190 intake valves are good to go on the 348, the W's staggered valves rely on machined pockets in the block for safe exhaust valve clearance. We need to make the pockets deeper with an Isky valve-notching tool (right). Its 1.750-diameter cutting head is slightly larger than the exhaust valve. View Related Article
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