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Tom's pistons are from Wiseco and are built to his specs. The 300-gram units will use horizontal gas ports (not machined yet) to push the top ring into the cylinder wall and seal completely. The deck is .170-inch thick and has a high top ring (only .140-inch from the piston top) to maximize compression effectiveness. This will also allow Tom to keep .150 inch between the top and second rings, giving a generous air gap between them to help stabilize the rings. View Related Article
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