[stevehaygood]

There was an article in either Car Craft or Hot Rod recently. Gt-40 iron heads bolt right on a 351, but the GT-40 has 7/16 "bolt holes and the 351 has I/2". So the GT-40 has to have its headbolt hole made bigger. Also the GT-40 has small exhaust ports which makes for a higher exhaust speed exiting, which is a function of creating torque. I was told to port match the heads and get a 3 angle valve job. A Comp Cam and edlebrock performer and a holley 4 barrel. No more than a 750cfm though on the carb. Should get between 350Hp & 400HP and around 350 ft/lbs of torque