Thanks for the info, Jim. I didn’t find that rpm range info before for the F4B. I don’t think that I’ll be running that motor to 7000 – at least not on purpose. I was wondering about the "Performer" saying only 5500, but this is a street car that only occasionally autocrosses at this point.
I suppose that there has to be some advantage to the weight savings alone.
I was originally wondering if there would be other plusses vs the stock cast iron manifold – thus "Better"(?).
The new "Performer" manifolds are about $160 new at Jeg’s, some of the F4Bs that I saw were over $340 on e-bay, I think that the higher priced ones were already "high temp coated", thus more $. The "RPM" manifold sounds good – but that is pretty tight hood clearance.
I wasn’t sure about the "original option" deal… that does make the F4B seem more attractive, but don’t know what that "from 2500 rpm" deal would do to regular "driveability".
I’ll keep gathering info…
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