Head Porting

Slantsix64 said
After the porting is done iam going with the 170 intake valve and 144 exhaust valve and a .100 mill of the head if its stock CC's. 20 horsepower here i come! lol

The porting can't be "done" until after You've established the new pocket with the O/S valves,....and that's the most critical part................