We originally went .03 over on a 408 stroker, 6.0 liter iron block. Worked great, put a tvs 1900 on top and made 727 hp and averaged 650 ft/lbs on 6.5 lbs of boost. No oil burning and my gas mileage went up over the old 6.0. Now the important news, broke a value spring and dropped a value in the motor. Beat the crap out of 5 pistons and scratched 5 cylinders. The good news is now we can still use the block without a sleave and bore to .04 over. At .06 over if something goes wrong you are **** out of luck. Go .03 over, stroke it correctly and you'll enjoy the **** out of it.

 

IMO, bore it as little as you need to If it were me and I could get away with just a hone, that's the route I'd go. As mentioned, if you go 60 over from the start and something happens, you're **** outta luck

 

some good info guys... i was always curious y people wouldnt go bigger than .03 over.
now it makes sense, if i cant find a lower mileage lq9 i'll just get a high mileage and go .03 over..
i want the LS2 rods incase i wanna spray

 

Can a 6.0 be bored to 6.2 and just use stock 6.2 pistons?

 

well the 6.2 bore is 4.06.. im just not sure on the rods, im sure someone will chime in weather its possible...

 

Wouldn't that make it a .06 over 6.0??? In which case was said not to be the best option... I do believe the blocks on both engines are diff

 

The older blocks had bad core shift and some couldnt be bored .06 over. Its a good idea to get the blocked checked after boring it that much. Ive said it before, if you want to get a long life out of a stroker go with an aluminum block. The cylinder skirts are deeper and stabilize the piston more, therefore less oil burning. When/if I do another stroker it will be out of an LS3 block.

 

supposedly its possible to bore out to 4.080 if you sonic testing the block.

 

well if u plan on spraying...just bore to 4.03 and put a set of forged rods and pistons with stock crank and have a 370ci.

 

4.065 and making 1200+ here u will be fine...