AKMac

iTrader: (4)

I'm currently running 1 3/4" Pacesetter LT's on my H/C/I LS1 through 3" true dual exhaust with bullet mufflers. I'm very satisfied with this setup and it's has held up well.

My new engine specs are:
402 LS2
Eagle 4.0" forged crankshaft,
Callies 6.125" forged H beam rods
Wiseco forged pistons 8cc
C&A Dura Moly rings
ETP 245 heads
244/250 .646" .646" 112 LSA
Custom Sheet-metal Intake

Is it really worth the $800+ bucks to upgrade my headers to 1 7/8"? How much horsepower will I gain and torque will I loose?

My goal is to put down 550rwhp so if new headers help me reach that I will wait to put the new engine in to save enough money for new headers.

GTObsessor

iTrader: (2)

I'd say its worth it... you've got pretty much top dollar on everything else except the crank lol. Pushing so much air, I'd say a 1 7/8" header would definately be worth it on your setup. Looks like its gonna be a monster.

aNuBiS

iTrader: (25)

Im in the same boat, and will bump this for more opinions, and maybe some dyno and/or track experiences.

LS1crazy01

iTrader: (14)

Yah with those cubes I would say you can pick up a few HP from 1 7/8ths headers. Kooks has some nice stainless ones and I know hooker is making stainless now but dont know if there in that size yet.

382ssz28

iTrader: (24)

Kooks 1 7/8" X 3". Part # 6501RHS has no emission tubes, but has an O2 bung on each hedder. I just recieved mine this week. I have a 382" w/Compstar crank and rods,(6.125"), and 3.905" bore with the coated Diamond pistons, (11.1-1). I have a Mufflex 4" pipe into a Spintech muffler w/ dual 3" tails. This system works outstanding. The hedders should really work nice on yours. I have a Nick Williams 90MM T/B w/ Fast 90MM intake. ET Perf 316-241 heads. Comp .595"-.598", 232-234@.050", 112LC, comparitively speaking. If you had to pay $1200.00, it would be worth it! I had the Dynatech 1 3/4" hedders, that did work great, but when I upgraded to the bigger cubes, the motor would not breathe. Make the call. Scoggin/Dickey had a great price and they were in stock, talk to Marty. Good luck.

AKMac

iTrader: (4)

Thanks for the input guys. I talked to a few other people and they all agreed with my goals it would be best to upgrade the headers, especially if I want to spray it in the future.

I have my eyes set on some American Racing headers. From what I've read they seem like a quality unit that fits and flows well.

JL ws-6

iTrader: (50)

If you're on a sheet metal intake because the motor needs it, then the header's certainly will show some gains as well.

Personally, I'm running a 13.5 to 1 compression 402, cam not all that much differnet then what you're running, and went from 1 3/4 qtp's to a set of 1 7/8 stepped to 2 inch kooks. I can't imagine it's going to hurt, then throw the 100 to 150 shot that I run on top of that, I'm sure it can only help.

I am more intrested in the intake that you're running, that's about the only thing I really have left to mess with other then going solid roller.

Tom@ARH

Good choice let me know if you have any questions

Hard Core Z28

If its an all out race car upgrade to 1 7/8 and go with ARH. If its a street strip car and drives on the street stay with the 1 3/4. It will keep the punchy low end up. Going with the 1 7/8 will bring the low end down a little bit. All depends on what you want to do with the car.

Oso SS

iTrader: (3)

if you do decide to upgrade you can always sell the old ones to help offset the cost. I agree with hardcore Z, it will affect your low end a little and help up top when the air really start moving, but if you're going to spray then why not?

aNuBiS

iTrader: (25)

He has a very nice size cam, huge heads and a sheetmetal intake... this car wasnt built for low end. I say go 1-7/8" and dont look back. You stand more to gain than lose.

I know I will be