Rocky good statements on the guy who denies they flow better. I have a non Superflow bench single orificeand EVERY round port head has flowed better than a D port in the same condition(stock, mild porting).
I found a signifigant improvement on the RAIV heads using a flat valve vs their tulip design also.The HOs come with a flat valve.
Rocky I can't find access to it what rpm range were peak TQ and HP for factory round port 455s and also similar low compression D port 455s with teh same cams?
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