original camshafts
I am not an expert on camshafts , But after reading long posts with people discusing lifts & lobes,duration & overlap . on original vs aftermarket cams . I have a question .Why cant cam makers just copy an oem cam using specs, or a good oem cam instead of making one "close or improved".
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Re: original camshafts
Bill -
That's what Federal-Mogul/Speed-Pro/Sealed Power (and possibly others) have done with their blueprint duplicates of OEM GM cams. As for the aftermarket/hot-rod cam grinders, "Marketing, son, marketing....that's where the money is".
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Re: original camshafts
Just let us know what you are looking for and someone will post the part # for your application .
BillComment
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Re: original camshafts
OE cams have mild dynamics for durability, which pretty much guarantees a "bulletproof" valve train. Aftermarket vendors push the dynamics to higher levels, which usually requires stiffer than OE valve springs. This may provide somewhat better performance - though not necessarily over the entire rev range from off-idle to peak revs, but possibly at the expense of durability. OE cams cover everything from mild to wild, and do so with excellent valve train durability.
That's why on the cams that I designed, I only used proven OE lobes, so OE valvetrain durability is retained.
DukeComment
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Re: original camshafts
John,
I hate to disagree with you, since you know far more than I do. But from post #55 by Patrick Boyd in this thread, even Sealed Power may not be making their cams exactly to the GM spec anymore:
Maybe it's a moot point since it's just the lobe width, but I thought I would bring it up for the sake of completeness.
JoeComment
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