GM 820 casting port tips needed

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mitchmc
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GM 820 casting port tips needed

Post by mitchmc » Wed Jun 08, 2011 6:50 pm

Hey just wondering if anyone has any experience with porting the 820 bbc castings on the forum? I have them on my 402 right now, totally stock heads, and looking to get a little bit more out of them. Just looking for a mild port job here and i'm not too experienced. I've done some searching and could only find stock flow numbers on them. Any tips appreciated!

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