Seller notes

This tillotson casting has been milled .060 to give it right around a 17.5cc chamber, ported, 25/32 mm valves, 36 lb dual springs installed at 42 pounds and lots of love. It's perfect for your 308, 356, etc cam and ready to bolt on to make power. I do not recommend a 32mm for gasoline back yard riding but that's up to you....

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