Power advantage between Ford 351, Mopar 340 and Chevy 350??

They would also raise the bottom of the port with a "tongue".
Those Clevo's were pretty good performers here with Touring car racing..

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Yup, those worked pretty good, but I'm more about using the whole port and just getting the cam compression and port shape as matched as possible. I think there's power to be made with the port pretty much as is. Ford did too. They were right.