Markbo

I have not been here in a long time-my car has been off the road for a long time... it's a long story.. so I will keep it short. Let's just say that I need a cam for my 396 stroker and I really would appreciate some advice from you 396 guys.

All pertinent details are in my signature. What I have built is not a strip car. I have full weight (and them some) and a suspension and brake setup better suited for autocross. Someone here described it as a 'dragstrip engine in an autocross chassis'. A good analogy I think of a fast street car.

I won't be taking this one to the strip or track - well maybe once or twice, but you get the idea. I would like 'some' lope in the cam, but not too much... I can't have any vacuum or idle issues. I want to run the A/C in Houston Summers and be able to drive this in traffic without any lurching or bucking or any of that.

I would like a broad torque curve. This engine is capable of revving high, though I doubt I will be doing any 150mph cruises so high/flat torque line is more attractive than high HP.

I hope I have included enough information and clarity on performance preferences. I would really appreciate any advice you guys with specific 396 experience can offer.

Many thanks
Mark

Markbo

TTT - anybody?

96speed

Hey Mark .

I am running a GTP6 cam on stock heads. I have some cam surge, but I also drive the car everyday rain or shine. With more cubes and gears (I'm running stock 3.42:1s) this cam would drive much more tame. I gained 5mph from this cam alone without a dynotune, yet.

There was a guy at HRP a few weeks ago with a combo like yours with a GTP6 cam - GTP heads/396, but with an auto. He was running 11.50s @ 119mph (~3600). He was cutting 1.6s on 17" nittos off of the footbrake - this cam makes power.

Ryan

Markbo

THe GTP 6 is actually a little smaller than what Comp cams recommends, but the guy could not clearly tell me what to expect insofar as streetability or torque line. He suggested a custom grind with these guidelines:

Intake - 240 - 244 @ .50
Exhaust - 248 - 250 @ .50
114 LSA
lift .576 in/ .600 ex.

The GTP stage 2 heads have a competition valve job, 2.00/1.56 valves, fully ported and polished then flow bench tuned for 280/210cfm. Checked one chamber that came out around 68cc.

I honestly do not know what these cams would do in my car. I have lost what little cam knowledge I had over the last couple of years being out of the game. I could have all the chambers cc'd and the heads flow tested, but these numbers are close.

What do you 396 guys think of these choices? I don't 'need' a high HP/MPH cam... I won't be running any high MPH races. I want a lot of grunt from the get go ... i.e. for a street car.

Anybody?

CoUnTryMuZiCZ28

You should give www.combinationmotorsports.com a call, they will get you squared away..

JPSartre12

Mark,
I read your post, then I read your mods. Looks like we have a lot in common. I have a similar bottom end, Callies crank, JE Pistons, forged rods, etc.
My cam is a Comp Cam custom ground with 630's lift, 240's duration and 112 or 114 separation. I'm in the process of trying to get more detail from the car's builder. (I've only owned the car for a few weeks)
I have CNC ported heads, matched manifold, 30# injectors, etc.
My engine has a definitive lope to it, idles between 925 and 1050, hasn't stalled yet even with the AC on and I drive in heavy daily traffic. It sounds so good that a Rustang driver who pulled up next to me yesterday at a stop light looked over and said "sounds good" and as the light changed he crept away with his tail between his legs.
I have a high stall torque convertor and a TH400 and it doesn't surge at all. It just rattles everybody else's windows.

Markbo

Thanks JP. I would appreciate very much if you could get all the specs on that cam and also give me an idea on your HP/torque numbers.

Mark

Brettinator

Crower solid roller cam - advertised dur is .290/.296 - .260/.266 @ 0.50 overall lift .585/.597 @112lsa. RPM range 3250- 7250 redlines @ 7750. It's a high revving cam, but very streetable with a 3500 stall (in a TH350 for example) so your converter would come in about the time the cam starts making power. It's all synergistic though, like you need the right gears, rear-end. Crower calls it the ultimate hot street performance cam is what it's called in the Crower magazine.

PN# 00427

JPSartre12

I'm going to attempt to get it dynoed on Saturday, so I'll let you know.

Markbo

That would be most interesting JP, I appreciate that very much.

Mark
ttt

Markbo

Anyone else have any advice or leads? I would REALLY appreciate some help.