GTA600

For my car we are pondering....

(keep in mind we have visual/sniffer emissions)

383- KB pistons, 4 bolt mains, machined stock 400 crank, stock 5.7" PM rods (should I run a forged crank?)
AFR 190 heads (10:1 compression)
(or should I use Fastburn heads?)
LT1 intake with remote mounted EGR
52 mm throttle body with air foil
Comp 224/230 0.437/0.445 112 lobe hyd roller cam
1.6:1 full roller rockers
Street damper
Edelbrock aluminum water pump, and 180 degree thermostat
MAF setup with 24lb injectors and DIY PROM
Hooker 1 3/4 headers with random tech cat and 3" catback (maybe flowmaster, any suggestions?)
GT Auto Acc. Ram-air induction kit

2400 rpm stall (not sure which one yet) 700 r4 tranny w/shift kit
3.70 rear gears in currie ford 9" with complete spohn suspension and dennys driveshaft

11s? 10s? fun to drive? bad gas milleage? Any suggestions to changes? Maybe 355 instead of 383?

I'd like 11s with decent gas milleage. If this could be accomplished via a 355 i'll do that, (same setup)

SPEAK YOUR MIND...OPINIONS WELCOME!

Pony Killer

i guess. my point is this, if you want to fool the emissions folk, you have to make it look like it's supposed to be there. An lt1 intake isn't supposed to be on that car.

if you wanna fool the inspector your going to need something more stock looking, like a modified LT runner setup. in which case the 383 would still be a good idea.

Check out the post in the aftermarket parts section by mike crews. he's got a very strong LTr setup, that could probalby sneak by a sniffer.

Personally i'm no big fan of the afr 190 heads.
If it were mine, i'd go with something like mike's motor, with the XR269hr cam, and vortec heads.

it's a nice setup, with good power, and very sneaky

CamaroDriver

The parts all look like you're going for torque. The gears, the cam (which I have a question on), the intake, the heads and the stall are a good combo for torque.

The question on the cam is why such high duraton numbers on such low lifts? I know roller cams usually have more duration under peak lift, but .437" and .445" with 1.6 ratio rockers? That's not much more than the stock peanut cam. That'd be .410"/.417" with 1.5 rockers. The stock LT1 cam has more lift than that. Hell, the stock LT1 cam has more lift than yours even if you use the 1.6" rockers.

You may need a different cam. I don't know if that's a typo, but I'm hoping it is.

I'm gonna guess about 375-400HP with the setup you're working. It might put you in the mid to upper 12's with good traction. I wouldn't bet the farm on it though. I'd say low 13's for sure.

Traction is going to be your worst enemy with a low RPM motor like that. You may want to try it with the stock TQ first just for a better hole shot.

QwkTrip

iTrader: (22)

Good combo. The only thing I would suggest is to use a cam with more lift at the same duration. Those AFR heads will flow more air if you give the cam more lift and that means more power. Otherwise, this will be a really fun car to drive and very responsive on the street I agree with the 375 to 400Hp. I would not use a stock stall converter. Keep using the one you chose. The looser stall converter will get you off the line quicker and keep the shifts softer when you're just cruising around.

GTA600

oops...typo...sorry

XR276HR
276/281, 224/230 @.050, .503/.510 (with 1.5:1), 112 lobe
.537 and .544 (with 1.6:1)

I think the LT1 intake will look ok, especially if I explain that the EGR Is functional, and its short runners will offset the other torquey parts...so i figure at least 450 hp.... TPIS got 450 out of a 350 with a 226/226 cam and fastburn heads...and the 190s flow better than the fastburns

i'd like to push my powerband a little higher....maybe same intake/heads blah blah with this cam


290HR-12
290/307, 230/244@.050, .510/.540 (with 1.5:1), 112 lobe
.544 and .576 with 1.6:1

Jade Grey

iTrader: (1)

I may be wrong, but I don't think you can run a modifed LT-1 intake with EGR. The LT-1's EGR is where a distributor would be.

Check with John Millican for sure. He's a member of this board and also a citizen of GA. He had a website devoted to this conversion, but the link no longer works.

Berlinetta

id go with smaller heads. You combine that relatively mild cam w/ something like mild ported/polished vortec heads w/ your 383 and you will produce some absolutely killer low end torque, if thats your goal. I think that this setup could very easily get you into the mid 13 second range w/ good tuning and traction and im making a conservative guess there. It would be fun as hell to drive, w/ all the torque, and your gas mileage really shouldn't suffer that much.

if you want more top end horsepower and not so much low end torque, ie your not going to drive it on a daily basis, id stay with those heads and get a bigger cam.

if you want in the 11's, you should forget about decent gas mileage.

wm_sorg

If you have an auto I would stay away from the 112 LSA especialy if you have to pass emissions. Also, I am not sure if 24lb injectors are enough to feed that beast.

83 MidniteZ

The emmision tests here don't even open up the hood anymore! So you really have to worry about your intake setup or EGR. Just choose a cam that can pass the sniffer.

88IROC350TPI

Heh, do you guys notice this thread is like 2 years old?

Berlinetta

lol