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Valve-to-bore contact is most likely to occur on the exhaust side. Grind clearance as needed. Maintain 0.025-inch clearance between the bottom of the notch and the top of the piston ring land at top dead center.
672HP Pontiac 350

 Valve-to-bore contact is most likely to occur on the exhaust side. Grind clearance as needed. Maintain 0.025-inch clearance between the bottom of the notch and the top of the piston ring land at top dead center.  View Related Article

 

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