| you will also gain a ton of airspeed if you square up your runners and side walls. Modifications to the runners will see a gain on average of about 25-30% increase in overall airspeed and CFM gains. Your on the right track in taking those out though..not too many ppl do this and its the right way to modify a set of cylinder heads. Next thing to do is replace all the old valves into the heads and grind that spark plug boss down. Just remember when you go to modify the cylinder heads you constantly measure your bore at the inlet and the seat of each runner.
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