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Old 09-14-2004, 05:16 PM
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Join Date: Oct 2003
Location: Queen Creek, AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
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Ernie, Ernie, Ernie,

I am trying to talk you out of the flat tappet solid cam specifically to get you low RPM grunt.

I told you about my 12 sec Vette. What I forgot to add is that I do a 12.4 all day long in a bad tune, shifting at 5800 rpm. I could rev it to 6300 or so (cam card says redline is 6500), but why when I'm already 12.4 sec in a 4000 lb pig of a car... It has so much torque at 2500 rpm you can't keep the tires under it.

If you want low RPM grunt get the hydraulic roller cam. you can get more lift thru the cam profile with less duration and overlap (think low RPM grunt here). Think truck cam with max torque, but also huge power due to big lift.

Also consider this: You can get a hydraulic flat tappet with the same ramps as the solid, it just won't wind over 6500 rpm. That is the only reason flat solid cams were ever produced (high rpm stuff). You're now saying you want low rpm usage, but you're going to a high rpm cam (???)

Did I mention I shift my hyd roller motor at 5800 rpm? Hyd roller cams are all about low rpm grunt if you keep duration short and separation wide. They are especially good if you're not going to run big CR.

Please think about this again. I'm trying to help you here. You seem like a nice guy and I really liked it when you bought this car and actually raced it. You may think my advice is not good since I don't build Fords, but as far as cam science goes, engines are pretty similar - and I have suggested you call the cam guys for the specifics that may be related to head design, but if you take my general advice on approx lift, duration, and separation, you will have huge torque, response and power without having to wing the rpms.

BTW, the cam recommended above by Anthony has more duration than I would recommend and not as much separation as I'd recommend either. Also do not go for the triple springs. Triples rub during actuation and will build too much heat and will fail. Crane originally spec'd triples for my cam and I changed to doubles and now Crane spec's doubles for my cam too (they learned about 8 years after I told them).

I'll cross my fingers for you. BTW, I'll mind my own business if you want, I just get the feeling you're gonna be less happy than you could be.
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