Offshoreonly.com - 555 bbc wondering on upgrades intake, carb, headers

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Quote:

Originally Posted by SB (Post 4745986)

Thisislivin - manilla folder paper with a ball peen. Much easier than cutting.

Ooops, let out another speed secret. LOL. Just playin.

I do this more with exhaust ports vs exhaust header/manifold. You'd be surprised what you find. This is a bigger hurt on power than intake mismatch. Sometime Yuge.

If not sure what I'm saying use that as search terms and you'll find some old guy doing it this way. :)

Actually you reminded me the AFR heads are designed for cars and the exhaust ports have a hook in the top of the port that will really mess with the flow into an upturned exhaust. I removed the hook on mine when I ported the heads.

Yes, good call and exhaust manifold/header flanges blocking some of the port on various engines/head/exhaust combos.

People check intake mismatch and not exhaust, but exhaust mismatch, again if even slight blockage if head’s exhaust port, can cause some pretty serious power reduction.