482" FE, w/58mm TWM - cam choice - opinoins please

[blykins]

Good points Barry, I didn't really give much thought to the intake setup.

[BMEP]

Thanks for the input, all.

FWIW, I intentionally chose the cam I have and I think it was the right decision - especially based on feedback here. FYI, The same cam I have is also available in a higher overlap grind (110 deg LC), as well as the 112 I picked.

RICK LAKE: thanks for the offer to help - I appreciate it. I've got 17" (335 rr, 275 ft) rubber. Exhaust is still in the works but I'm starting with the FFR 2" primary headers (would rather have 2.125" or 2.250" but I already have these). After headers, I'm planning on merge collectors into some fairly open mufflers -- right now I'm thinking the Stainless Specialty 3" ceramic open core mufflers (not much of a muffler, I know). We'll see... I'm willing to tolerate a lot of noise but that may be too much. For a while, I was thinking that a fabricated baffle type muffler (e.g. a DNA or similar) would be nice but I can't find anything with a pretty looking O.D. - which matters to me since it's going to be a sidepipe. I'm also installing a 3 qt Accusump. Suspension: Front: SLA IFS (steel arms), rear: Gordon Levy 5 link. Levy Koni shocks, fairly big brakes (13" ft, 6 piston Wilwood calipers), 12" rear (4 piston calipers).

Barry_R: Really good point about the amount of throttle area/change with that induction setup. That makes the need for a decent progressive linkage even more important.

[SFfiredog]

That was pictured a few posts down.
504 ci. 10.75 to 1
CNC ported heads and hand ported intake.
The intake ports are as far over as the pushrod tubes will allow
and are a bit smaller than the heads.
The cam is 262/266 @.050 .691" .697" lift with 1.8 rockers on a 112 lobe center installed on a 107 intake centerline.
It is a mechanical flat tappet with Schubeck composite lifters.
Idles at 750 rpm with 11 to 12 inches of vacuum.
545 hp @5600 at the rear wheels with the crappy Superformance 1-7/8 headers and restrictive side pipes.
603 ft lbs of torque at 4700 rpm...at the rear wheels....
Drives like a stocker... pulls like a freight train...
The power and torque dips about 30 to 35 hp right about 4800 and picks back up at 5200.
It is reversion caused by the really short intake ports. I am trying to tune that out with the laptop but I wish I could put a longer stack on this size engine.
My calculations show it would really like a 12 to 13" stack... Not very practical or attrative on a Cobra...
Also the wide lobe centers help with drivability but ultimately hurts a tiny bit on the top of the torque and horsepower levels... not enough to really matter though...

[BMEP]

Originally Posted by SFfiredog

545 hp @5600 at the rear wheels with the crappy Superformance 1-7/8 headers and restrictive side pipes.
603 ft lbs of torque at 4700 rpm...at the rear wheels....

That's pretty good! Must be ~650 FWHP... and that exhaust has to be costing at least 50 hp - I bet more like 75-80. It would be interesting to know how well those lifters hold up.

I've been looking at the ports on my intake and can see that I'm going to be in the same situation -- against the pushrod tubes and still not as wide as the ports on the heads.