dklt1

Hello everyone, I just purchased a 98 trans am for a really good price the car is completely stock at the moment with an automatic transmission my original plan was to put a 408 lq9 stroker in the car with f1a procharger but due to low funds my build has changed. I was wondering what would be the best build to help me achieve 650 rwhp out of a ls1 and d1sc procharger? What type of heads should I run? I plan to run a fast 102mm I take with fast 102mm throttle body and Texas speed 100mm maf hooker blackheart long tube headers with hooker blackheart true duals race exhaust. I want to run about 10-12 lbs of boost but the car will be mainly used for street use barely ever seeing the track. Any information will be greatly appreciated thank you in advance!!'

conan

iTrader: (5)

Save all the $$$ on the intake stuff and put it to use on the Procharger, fuel system, and exhaust. Don't even buy a MAF, Get a 2 bar Map sensor and have it tuned on speed density. You can also meet your power goals with the ls1 or ls6 intake and throttle body.

What heads do you have on the car currently ?

neverstop

lots of guys have made 1k hp and gone into the 8s with stock intake and heads

dklt1

the car is currently 100% stock other then aftermarket panhard rod and eibach lowering springs from previous owner.

ramairetransam

iTrader: (18)

get an aster bracket from the start
ati balancer
cbm 8.6 crank pulley
dual fans
fmic
2 bar map sd tune

conan

iTrader: (5)

Can you confirm the casting # on the heads if its all original 1998 they should be 806 casting #'s.

Here is where you'll find the casting # on the head.

dklt1

the casting numbers are 806 on the heads I checked this morning before work. I plan to forge the bottom end will the stock crank be okay or do I need a forged crank as well? Also what size pulleys do I need to achieve 12 lbs of boost on the d1sc procharger? Thanks

conan

iTrader: (5)

Stock crank will be fine for what you want to do. I would pick up a new set of heads either GM casting or aftermarket depending on budget. The 806 casting heads have a notch in the casting and with out some work you cant use a MLS gasket with those heads. I would choose what heads your going with first and then buy pistons to fit. If this is a street car I would keep the compression up in the 10-10.5:1 range. Also boost #'s will depend on how efficient your engine combo is. 12#'s of boost will make different power levels depending on the engine.

Whats your budget for this ? Whats the power goal ?

dklt1

dont really have a budget at the moment just trying to get feedback on what to look for to make the numbers I have set as my goal. From what little I've read is to go with ls3 heads maybe with some port work and either weisco or diamond flat top pistons not sure on what cc? Also what size cam? Like I said I plan to run the d1sc procharger on the car to reach around 650 rwhp. I know I need to upgrade injectors and fuel pump as well. When I have the car tuned I just want it tuned on 93 octane..... what would you recommend? Budget friendly not looking to spend 8-10k just on engine work

conan

iTrader: (5)

I would stick with cathedral ports and find some 243, 799, or 317 heads. You can reuse your current intake and have better low/mid range power out of boost VS the square port heads on a smaller CI motor. You can then choose a piston dish for your compression depending on what heads you end with. 317 heads have a bigger combustion chamber than the 799 or 243 castings. I would shoot for 10:1 compression ratio with your combo. Go with some Ls9 head gaskets and ARP studs.

roastin240

iTrader: (13)

you cannot run LS3 heads on the 3.900 bore on the LS1, the valves do not clear. Need at least 4 inch

dklt1

I have decided to go with 243 heads, is there any specific manufacturer you would recommend? Also I need a custom boost cam but not to sure on what kind to get.

conan

iTrader: (5)

What do you mean manufacturer ? The 243 heads ?

Bob@BruteSpeed

iTrader: (16)

243 heads were made by GM. A good set of aftermarket heads would give you a good power increase and have a thicker deck, which helps prevent head gasket problems when you're boosting above 16 psi. Here is a set I recommend. http://shop.brutespeed.com/AFR-1630-...l-AFR-1630.htm

http://shop.brutespeed.com/Brute-Spe...d-Camshaft.htm
This blower cam has proven itself over they years and would work great for what you're looking for. Bob

dklt1

thanks for the info bob, in your opinion is it possible to get 650 rwhp out of a forged ls1 with 243 heads the cam you recommended and a d1sc procharger on 10-12 lbs? Also how would I achieve my 10-12 lbs goal?

Bob@BruteSpeed

iTrader: (16)

You're welcome. With a forged pistons and rods, the cam and good heads, you can easily make 650 rwhp with 12 lbs of boost. I'd go with 80lb injectors and two Walbro pumps in the tank. Bob

dklt1

do I need to change pulley size to achieve 12lbs? And I plan to use the car for 99% street use I'll hardly ever take it to the track it'll just be a fun car to drive around town and on the weekends! What do you think I could achieve with a single fuel pump and let's say 60-65 lbs injectors? Thank you.

Mike 02T/A

iTrader: (28)

Get the F1A before the Fast intake!

Prowler

iTrader: (1)

Your stock engine with:
Brute speed blower cam kit
aster bracket
ati balancer
8 rib setup with 4" S/C pulley
Brute speed CBR 8.65 crank pulley
dual fans
fmic
2 bar map sd tune
Kooks 1-7/8 Long tubes
a single 340 fuel pump

Stock engine and heads save u money. Now with this stuff u should be going good. U can have fun with this and be building your built block and some good heads. If u want to jump into a built 421 engine with AFR heads. I have a, just built set up with 0 miles on it for sale. Has a brute speed blower cam in it. Also have headers, Victor Jr intake and TB.

dklt1

are the 243 head ls6 heads? I'm trying to find a set somewhere and that's all I keep coming up with. Sorry I'm new to this whole building a ls engine thing. I found some prc stage 1 ported CNc ls6 heads but I didn't know if those were a good choice or not or if it would be cheaper to find some stock 243s