christiandoy

iTrader: (1)

Hey everyone is it safe to bore out my block to fit 3.905 wiseco pistons?
anyone done this before?
Please let me know asap

bww3588

iTrader: (49)

Yes. That is about safe max limit on ls1's.

mark21742

Yup you can do it, but I'd still get the block sonic tested since that is max bore

bww3588

iTrader: (49)

^^^this. If you haven't already bought pistons, I would go with a 3.903 piston to leave some meat in the cylinders.

christiandoy

iTrader: (1)

There's a guy on here selling me the pistons complete with the rotating assembly so I kind of have no choice.
Thanks guys

mark21742

Now if you get the assembly and can find a cheap iron 5.3 block to bore out end drop it in, then you could still take the 5.3 block farther later.

Plus if you stick with your ls1 block make sure the shop that bores your cylinders out has a torque plate.

ABQ99TA

iTrader: (17)

I'm running that set up right now. I have about 530 miles right now and will be headed to the dyno soon. I have had no issues.

conan

iTrader: (5)

I'm running 3.905 mahle pistons in my ls1 block, no problems here.

Hemi Killer

iTrader: (6)

What year is the block? 97-98 blocks can only go 3.903" max.

christiandoy

iTrader: (1)

it's a 99 @Hemi Killer
Phew lol I already bought it!

christiandoy

iTrader: (1)

Thank you for all your responses! they have helped me a lot =D