Quote:
Originally Posted by mikedsilva
Probably need to know your fuel delivery system too...CIS, itbs, CARBS?
This will dictate how big a cam you can run, which will determine how much compression you can use.
If keeping CIS, you are limited to 964, webcam 20/21 or William Knights M1 cam.
With Williams cam, you will be able to run a little more compression but I would imagine you should err on the side of caution and go for 9.5:1 unless twin plugging.
But either way, let someone like William know your engine parameters and he can help you choose cams and compression that will work with your setup.
He has helped design a few engines for me now and every one of his predictions have been spot on.
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Thanks again for your input, I’m going carbs and from what info has been given so far it looks like I might be able to go 10.5:1. I Have a set of cams that can be reground to suit and as suggested I’ll possibly be able to dial in a lift that allows the exhaust to compensate for possible detonation, I have read a lot on here about different gas octane and how it affects these motors but I don’t have a reply from any actual owners as yet.