Got my new heads!
My old setup with a 233/239 cam and 70cc 317's put down 411/370.
I'm very impressed with the difference in runner sizes when I compare my old heads to the new ones. Everything is smooth and the exhaust ports are a lot larger. I think i may spend some time and gasket match the intake manifold since I'm going this far with the motor.

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Was also told that this cam with fast, heads, and exhaust a M6 vette put down 470.
So we will see. I am running through a moser 9" and Im not using a fast intake just a ls6.
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