Thread: polish and port

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as soon as my garage is finished i would like to polish and port my manifold. I have a edelbrock performer rpm manifold. I have a book that tells me how to do this. my question is how much hp will i gain. I am running a 350.

Do you mean match porting the intake to the head, or ??? Just doing the intake I don't think would account for an appreciable gain in power...... Most of the problem areas on the intake side are matching the ports and some pocket porting... Biggest gains on an at home job with no flow bench to equalize things would probably come on the exhaust side of the head.....

You dont want to polish any thing on the intake. I read a couple articles on doing it at home and where are areas that need real attention. You know cleaning up what you got. If your looking for big flow numbers you need a flow bench.

I am talking about a gasket match port and polish. sorry i was not clearer before. They have a step by step guide in the new issue of chevy high performance.

you dont want to polish anything on the intake....unless its the outside?? You polish the exhaust.

thanks big truck. that clears it up for me.

Unless your talking 1500hp plus with 30 lbs of boost.....

oh how i wish

That intake manifold is most likely ok . It's if your head ports look like this . Then they need the intake gasket match porting .

they guy who does my heads buys new cutters for every set of heads.

When porting out heads the Bowl area or also called valve pockets . Is were the most HP gains are . But the ports still need to be worked for the full HP potential .

You are very right Denny W . If you make an intake manifolds ports bigger then the head ports . It would be Like air flow hitting a wall . And then there will be a drop in The power . It is always better to have the head intake ports just a slight bit larger . COOL