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 .

Check out a book from SA Design, titled "how to build max performance chevy smallblocks on a budget". It's written by David Vizard, and has some good info on porting & polishing.

I got mine at a book store, but it's also available at cartechbooks.com.

Adam

Here's a couple pictures of basic port work. The intake and heads were matched to the gasket and the ports smoothed out some (but not polished) back into the manifold and head ports.

I also polished the outside of my intake and will never do that again. Buying one factory polished is a great investment IMO.

Kitz

beautiful jon thanks so much for the pics.

double post

heres a start....They also sale porting kits to get you started , Summit and Jegs do also.


Mondello Performance Products-Head Porting At Home

Mondello Performance Products-Porting at Home

I barrowed the first pick from above to show basicly what I started with and the finish product. They are both stock cast iron heads. Do plenty of reading before doing this you can ruin a good thing real quick. Another thing is that its real time consuming. If you are still planing on just port matching your intake it should be no problem.