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If you end up needing Slant rods I am a Molnar dealer. Tom

I can tell you an 500" NHRA Pro Stock engine uses 4.75" bore and run a 2.50" intake valve. if you use the 52.5% it calculates out to a 2.49375" size valve. So I am going to say it's probably a pretty accurate percentage if you have the right ports and chamber design. Tom