BQTransAm

iTrader: (1)

I spun a bearing on my 2000 Trans am.

Can I bore out my stock block? (90,000 miles) Provided of course that the block isn't damaged...

If I can, How far, and what pistons should I use for a strong nitrous ready rebuild?

Ferocity02

iTrader: (60)

I believe all you can do with the stock sleeves is get a finish hong, which is like a 3.905" bore max.

MountainMotor

iTrader: (2)

I believe Ferocity is correct. The largest bore you can go on the stock sleeves is 3.905" and then step up to 3.903" pistons.

BQTransAm

iTrader: (1)

Which are the 347 pistons?

GuitsBoy

iTrader: (4)

I believe you have to bore to take the bore out to 3.905. A hone would probably take forever to remove 7 thou.

MountainMotor

iTrader: (2)

The 347's, 383's and 395's all run that bore, the stroke is what makes the difference between the three.

Ferocity02

iTrader: (60)

Correct... A forged 346 would be made if you pull out the stock internals and put in stronger ones. A forged 347 would be if you pull out the stock internals, finish hone to 3.905" bore, then put in stronger parts with slightly larger bore pistons.

BQTransAm

iTrader: (1)

I am doing a stock cubed rebuild. I just figure I might as well throw some forged pistons in there to be on the safe side for a nice bottle shot. I am probably going to do a stock crank and rods though. What size n2o shot will this lower end set up support.

Ferocity02

iTrader: (60)

I would not reuse the stock rods if you plan on doing a forged motor with nitrous. The stock crank should work. Get some new rods, pistons, and main studs. Also replace the main and rod bearings while you are in there.

MountainMotor

iTrader: (2)

Agreed, the stock crank should be just fine but I'd replace everything that Ferocity said. Might as well do it right now and not have to worry about something little going wrong and damaging the whole motor.

moeZ28

iTrader: (7)

On the earlier blocks, all you can do is a 3.905. on the 01-newer blocks, you can go as much as 3.918, from what the machine shop doing my block told me. he had a GM book on the Gen 3 motors that said you can do a .020 bore on the newer blocks. my new pistons are 3.908 and my bore will be about 3.910 i believe.

2000_LS1

Personally, I think the stock rods would be ok for what you are doing. Just upgrade the rod bolts. Some ARP bolts run $125 or so, a lot cheaper than a set of rods. The stock rods are good for up to 550rwhp. I would start to worry at 500rwhp. To reach 500 rwhp you'd need a lot of spray, FI or a full bolt-on h/c car. I'm sure there are exceptions, but basically that's about it. These guys that say "buy callies, buy lunati, buy this buy that" must have a hell of alot more money than I do. I have forged rods in my 408 but I have stock in my 347 with arp bolts. Around 20-25k miles on them, with an occasional 150 shot. Believe me, you're fine. Save that $600 and buy yourself a cam and some valve springs. You'll like that much better.

MiaSSmaro98

iTrader: (9)

good info how much can the stock crank hold?i also read in another post that the 97-98 ls1 can be bored .005 only and all other years .010 over thats it.is this correct

Ferocity02

iTrader: (60)

I belive the stock crank has seen 1200 crank horsepower in Harlan's car, but then it came apart.

MiaSSmaro98

iTrader: (9)

im going to put an ls1 in my 89 camaro on boost wats a nice budget buildoff to make 700rwhp?can i keep the stock crank?im getting rods and low compression pistons.im also getting a brand new ls1 so will the stock sleeves survive?www.speedinc.com makes 800rwhp on there sportsman 347 and states nothing of having aftermarket sleeves

MountainMotor

iTrader: (2)

I've seen where a few people have tested the stock crank to 1000 hp and it held so the crank wouldn't bother me much. How much boost are you planning on running with your setup? Turbo or Supercharger?

MiaSSmaro98

iTrader: (9)

turbo,and i stated about 700rwhp