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Topic: Moneymaker: Question on Cams
Registered: Jan 2003
posted 03-25-2003 07:57 PM
You mentioned that you rarely install anything bigger than a 270S or H in a street combo. Why single pattern cams over dual pattern? Since most acknowledge that all original Ford iron heads (some better than others) have poor exhaust even with some ext porting. I have a 280H in a 472ci and I was wanting your opinion on whether to keep it as is or go to a dual pattern? How much significance is there?
Moneymaker, I appreciate your opinions.
To anyone else, please give your opinion.
From: Lyons, IL, USA
Registered: May 99
posted 03-25-2003 10:24 PM
Buck, you are generalizing my statement.
We were talking 302 or smaller Windsor engines if memory serves me.
Just who is "most" anyway? LOL
Are we talking Windsor SBF's?
Years ago the trend on SBF's was dual pattern camshafts. That was before we (the Cam and engine builder people) learned a few things.
Like for one, the stock exhaust port isn't as bad as they thought. Size DOES NOT mean everything.
SBF heads exhaust ports flow proportionatly to their ability to ingest.
We learned not to long ago that by concentrating on the intake side of our C5AE-B heads and leaving the exhuast near stock, we could make more power than if we made them round, or big. If you can't get it in, what's the sense of worring about how much you can get out?
A 472 CID engine with large valves can stand considerably more duration and lift. There is a lot more cylinder to fill and 385 series engines have pretty decent head flow stock. (assuming that you have a bored 460)
My old 460 powered 76 T-Bird land yacht responded very well to a Comp 268H which has some pretty stout specs on paper. The idle barely changed, yet the power increased dramatically. A testament to how undercammed those engines are from the factory.
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[This message has been edited by Moneymaker (edited 03-25-2003).]
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