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4.375" bore 4.5" stroke. I guess most others prefer the opposite to get to 540ci but mine works pretty well.

Thax. I was wonder if a 2.25 valve will clear a 4.375 bore.I'm planing on having some head work did in the near future so i can have the 2.25 intake installed

I run the 2.25" intake valve in my 440-1 heads on a 4.375" bore also. I recommend checking the valve reliefs in the pistons carefully to clear the larger dia.