grinder11

iTrader: (1)

I have been told the LS7 block comes with a 4-1/8 inch bore. But, I need to know the EXACT size. Does the block come with 4.120 bores that need to be honed to fit? Or maybe it comes with 4.123 bores that need VERY LITTLE honing. I have some pistons that have very little use, namely some Diamond forged units that have a diameter of 4.1200. As you can see, it would be too tight to run as delivered if the block comes with 4.1230 bores. But, this 4.123 size would be just about right to bolt down some torque plates and finish hone the bores to around 4.1250-4.1260. Anyone know for sure? Thanks.

TiredGXP

iTrader: (2)

it's 104.775 mm

r&d machine

iTrader: (2)

did one last year with diaonmd pistons did not have to hone at all
cylinder walls mic'ed out at 4.125 pistons at 4.120 the only machine work nesisary was balancing the crank it was out moer than i thought
it was a factory ls7 forged crank

r&d machine

iTrader: (2)

i did check with a torque plate