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Remember how Carlisle drilled cooling holes in the engine block? He drilled corresponding cooling holes in the head. Ford made Y-block heads with three valve sizes. 1.925/1.510 were the biggest, but they’re hard to find.
Y-Block Revisited

 Remember how Carlisle drilled cooling holes in the engine block? He drilled corresponding cooling holes in the head. Ford made Y-block heads with three valve sizes. 1.925/1.510 were the biggest, but they’re hard to find.  View Related Article

 

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