302 casting potential?

ou812 said

Sorry...but this is not true. As long as the porting/valve job/chamber transition is correct, the larger valve size "allows" more flow and velocity. Period. You can easily find this by probing the port with a pitot tube and see the increase in velocity with FPS using a Superflow Flowcom computer.
That's what I use.
It may be a waste of time if the guy porting does not know how to shape the port correctly and do the valve job/chamber mods.
I've made over 400HP with those heads on a 408 before. Pump gas too.

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hey i'm no expert here , but for a basic daily driver with a little grunt, larger valves are not the way to go. you can get 350-400 hp with the small valves. there have been countless threads on here all saying the same thing. for all out drag motors maybe this would work but not for a daily driver. it would lay down on the bottom end and be a dog until it got up in the upper rpm....ask rumblefish 360, bjr racing, and others on here they will say the same thing....


here is something bjr was able to achieve useing small valves in a "302 head" on a 318

"Valves are 85-89 302 318 stock valves on the intake side (1.78)
Exhaust valves are 67-69 318 (1.50)"

"This engine makes 470 HP at the flywheel and 376 to the ground. "

pretty good i'd say.....