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Thread: Lumps in your cam anybody?
10-02-2007, 06:10 PM #1
Lumps in your cam anybody?
No not lumps in your gravy...Lumps in your cam I said.
Alright, I haven't researched it much but can I get an aftermarket cam for the 5700 Vortec L31? I'm having a hell of a time finding one.
2007 Ford E250(Work van) (Ya, Ya, shut up!)
1996 GMC Sierra SLE 1500 5.7L/4L60E
10-03-2007, 05:54 PM #2Patrick
10-03-2007, 09:58 PM #3
I forgot about Summit, Thanks. There's 6 different kinds. I guess I'll have to see how much lump I can get away with. I don't want idle troubles or vacuum troubles.
You da man
10-05-2007, 12:47 AM #4
The wider the lobe separation angle the less lope you have from overlap. The less lope the more vacuum. Stay in the area of a size or two up from stock and you should be fine. I run a 415/430 cam in my flat tappet engines and it has good bottom end and power throughout. Stock for a 350 flat tappet was a 390/410 cam and a 305 HO and Corvette 350 cam was a 403/415. So as you see I am about two sizes up from a stock cam. The next size up would be a 420/442 which is a little smaller than a L79 327 of 447/447 and a 350/350 at 450/460. The thing to remember is today most engines do not run over 4000 rpm very often, most engines are running a little over 2000 rpm in overdrive at about 70 anyhow so you need to keep the powerband of the cam down low.
10-05-2007, 07:45 AM #5
Thanks Justcuz Very good advice. I haven't messed with a cam in a long time. It appears my auto skills need a little tune up (Thats why I went back to something I could tinker with)