Thread: 305 heads on a 350? can you tell me why?

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the heads on the motor in ???? are ported and polished. im considering this motor for my car. seen this done many times just never really new why. thanx for the info guys. im gonna list out the parts in this motor and have you guys tell me what you think, and if its worth what he wants for it. thanx again and check my new thread and let me know!!!

Originally Posted by jbuck72

the heads on the motor in ???? are ported and polished. im considering this motor for my car. seen this done many times just never really new why. thanx for the info guys. im gonna list out the parts in this motor and have you guys tell me what you think, and if its worth what he wants for it. thanx again and check my new thread and let me know!!!

Ported and polished, then equalized on a flow bench or just hogged out with a rotary grinder???? If the intake runners are polished, this is usually a dead giveaway that the guy is not a knowledgable porter, polished intake runners will allow the air fuel mixture to separate and form fuel droplets in the runners---not good.... Smoother is better on the exhaust side, though. Any porting work other then a bit of match porting of the runners and grinding out the casting flash when done without a flow bench is just a guess as to what happens to the flow charachteristics of the head..... Bigger is not always better...equalizing the flow to the cylinders should be the goal of porting, not just hogging things out till you hit a water jacket.....