Hey guys im new here but I got a project I start and stop because i didnt know which direction to go.I got a 355 LT1 that I plut together two years ago I want to turbo it but got some question is it wort it and is 600hp achievable. I also want to know the heads and camshaft i can use 383(388 0.30) 350) can take. Right now the car is: 355 281comp cam. comp push rods and lifters. ls2 valve single springs, 26ibs vemon injectors 255 walbro fuel pump. I bought Twin turbo headers and my buddy got me a scat forged rotating assembly 383 -22cc piston forged . I need some help guy should i go that rout or i got a 5.3 and a 6.2ls3 but i really want to finish the lt1 because it my first motor I built and my first car.

 

What is the compression on the 355?

What are the cam specs, even google can't make sense of "281 comp cam."

For 600hp a stroker kit isn't worth considering unless it is a screaming deal and you need to drop compression, and even then I would probably lean towards say a Trickflow head with 62-64cc chamber if that will get the 355 down to mid to high 9s for compression.

 

Twin turbo headers???

Do you have a link!?!

 

X2. They are prolly SBC headers instead of LT1 specific.

 

If you have a 355 now then you're already .030 over. Don't bore it any more if you don't have to. 388 is .060 over which is wayyyy too thin, especially for a stroker turbo engine.

 

Save your time and money and build a nice Nitrous Car. I would LOVE to build a wicked LT1 twin turbo car but in order to build one up that's nice and is gonna last is gonna cost you a pretty penny. IMHO turbo cars are really expensive and really finicky and from the ones I've been around there always needed **** fixed. Which is expensive.. A good Nitrous car is a 40-100$ fix every now and then. Plus I think N20 outlet has a nice LT1 plate system that you can get. Unlike NX or NOS which from what I've seen are just nozzle systems. To sum it up, if you have the scat forged assembly it will hold up to Nitrous. You should always use forged when dealing with Nitrous. I also agree with that if you already have a 355, that is a 350 .30 over. Don't go to a 383 or 388 that is way way to thin if your doing anything other than N/A.

 

I agree a nitrous car would be a lot cheaper and easier to take care of then turbos. And you wouldnt have to drop the compression.

 

Also please keep in mind. If you do go through making your LT1 twin turbo, Your 10 bolt rear end is not going to last long at all, if at all on 600+ worth of twin turbo SBC power. Build it from the rear end up.

 

Lots of people not shedding any light on his questions, I have a single turbo on my lt1. I have a 383 with -31 cc pistons with stock heads and intake that I did a small amount of hand porting. im running a off the shelf comp cam 305 on a 114lsa. I run 91 octane and 1500cc meth injection on 15 psi. I never have any knock at 26deg timing. I never had it on a dyno but ive raced cars making over 600rwhp and was able to walk away. btw I have a stock 10 bolt and never had an issue. That being said I know its a matter of time but im always easy on it out of the hole and just let the hp run them down. Any more questions feel free to ask.

 

A lot of people don't understand this concept. Having the suspension and drivetrain ready to handle the power should always be the first step. I know it's hard to leave the motor alone but it's worth it in the end. I know a lot of us can't go buy all of this stuff at once so if you're planning on building a quick car, start at the back and work forward. The only exception I usually give is boltons can happen before hand.

 

My opinon is that if you love the LT1 platform and dont want to go LS I say go for it. My motto is that "you dont need a LS to go fast". Sounds like you are going into the right direction. But dollar for dollar compared to a LS you would almost be close to 100rwhp more if you went LS. Its just too easy to make hp with LS which kinda takes the fun outta things. Turbo LT1s are getting harder and harder to come by. Nitrous LT1s are a dime a dozen and is a lot cheaper to go fast. SBE LT1 can take 150 shot easily but it takes a lot more thinking to build a boosted LT1. If money is not an issue I would boost away.

600rwhp is definitely achievable. But I would do away with the cam and get more of a custom cam specd to your ci, compression and turbo combo. Dont skimp out on turbo's, get a good one. And dont skimp out on brand of injectors either.

And your rear is kinda on borrowed time. Meaning it will last as long as you really want it too. If your gonna be a constant tracker I would say soft launches will preserve the life of the rear. If your a roll racer I dont see why the rear would last. But 1 hard launch can have you easily looking for a new rear. But there is plenty of low 10s LS and LT f bodies still on the factory 10 bolt. But higher hp will also heighten the chance of of something breaking too ie: stock 10 bolt

What heads do you have? I would call LE or AI and let them spec you out some good boosted heads and cam package. Also get some good springs too. A lot of NA guys get a big cams and dont upgrade the springs and run into issues shortly there-after. JMHO, maybe im wrong

 

Nothing sucks worse than having that dream motor of yours built up just the way you want it, but having a blown rear end and going home with your tail between your legs. Ask me how I know :p