Reply to "Camshaft Opinion"

In my opinion that is too much overlap and lift for a 4V Head.

The big intake valve is angled more than, for example a Big Block Chevy, I think. So Overlap has a bigger effect on a cleveland with 4V heads. GeorgeP has written a lot about this here in the forum.

And because the Intake port flows so much more than the exhaust port (see link below), I would make the split between intake and exhaust duration bigger.

https://www.speed-talk.com/for...=10300&highlight

You can also see that the flow numbers flatten around .550 lift, so more lift won't bring much power but increase friction and stress on the valvetrain.

I went with 226° Intake, 236° exhaust, 113° LSA and lift is around .540 intake and .560 exhaust ( I don't recall the lift exactly).

The 180s surely dont make much backpressure, I have no experience with them.

This is just my opinion, hope this helps and as always: sorry for my bad english!

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5/5/2212:06 AM

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