It's a long story, but I am finally getting my stage II heads back from GTP. These are going on a built 396 stroker in a 96 T/A with OBD l. I only have a faxed graph as yet, so I will give you the numbers as close as I can see them:

Flow @ lift .3 .4 .5 .6
Intake 208 249 275 292
Exhaust 159 179 199 212

I have cc numbers for the chambers if that would help, and I will of course have them flowed independently, but how does that look for stage II's?

Now I have to figure out what cam to use. This is for a weekend only fun car that must be able to run A/C in HOT weather and heavy traffic, and I can NOT have any vacuum or surging issues, i.e. my girlfriend must be able to drive this car.

What about these cam choices?
1. CC236-242-112 (.558-.576 lift)
2. CC248-250-114 (.576-.600)
Of course GTP is suggesting their GTP 6.

Any pros-cons, advice anyone can offer would be much appreciated. Also, what springs would you recommend, using 1.6rr's? I believe what are in there are too weak and he will upgrade them - I just have to know to what.

Just an aside, I also have a dual 75shot west system installed that will be used very, very infrequently. I would prefer to maximize for power without it than sacrifice daily power for the nitrous.

Here is as short a list as I can think of of engine mods that are pertinent:

Patterson Motorsports built 396 corvette block (4 bolt mains) stroker motor withM6 & Moser rear end
OBD I w/ Fastchips tuning (just an initial OBD 1 tune – a dyno tune will have to be done after cam installation) on all forged drivetrain- Callies crank, Eagle rods, Clevite bearings & JE Pistons
Note: compression ratio calculated to 11.8:1
GTP stage II heads & ported intake
Comp cams stud girdle kit & AFR hydra rev kit (high revving possible, but not necessarily wanted-more for ‘insurance’ than anything else)
Bullet proof Comp cams valve train (all came from GTP with the heads-magnum roller rockers, dual springs, etc, etc)
SVO 30# injectors
Extreme duty timing chain
Hooker ceramic coated long tube headers with Mufflex off road Y pipe & SLP dual/dual catback
58mm AS&M TB
160 deg Thermostat
WS6 factory hood w/ SLP airbox kit & K&N Filter
MSD 6AL & Timing retard, Taylor 10mm wires, NGK's

Any advice you 396 guys can give me on the heads, cam and springs would be very much appreciated. Once it's all back together, the first order of business will be to get it dyno tuned, but I have to pick the last couple of components.

Man, thanks in advance!
Mark

 

Nice set-up you're putting together there. I'd honestly talk to a few knowledgable folks in the advanced tech section to get their opinions on a cam.

David Vizard has a cam selection program that some have found to be very helpful as well (costs a few bucks).

 

That is definately a nice set-up, I wish I had had the cash when I put mine together, would have done a few things differently (piston choice for one). I used an off the chelf cam because of cost, but the custom route is really the best way to squeese the power out of those well flowing heads.

 

Does GTP have a website?