GNon18s

My friend hurt the no.7 piston in his Maggie 112 supercharged LS6. His car only has 13k original miles. I would like to just give the cylinders a quick hone/de-glaze and install new standard sized forged pistons. I saw somewhere that some say the whole rotating assy will need balanced with the new pistons. I don't totally get that because last time I had a motor built my machinist balanced my CRANK, then weight matched the rods/pistons. So wouldn't it be fine as long as the pistons were all weight matched? thought?

trik396

iTrader: (4)

As long as it is exact same piston and weight you will be fine.

GNon18s

Just to clarify, The motor currently has the stock cast pistons. We would be installing a new set of forged pistons (with a quick hone).

KCS

iTrader: (20)

The crank is balanced to a bobweight calculated from the weight of the rods and pistons. If the weight of the rods or pistons change, it can throw the balance of the crank off.

trik396

iTrader: (4)

Nope. Those pistons will be a different weight so you will need to balance entire assembly. Sorry.
Like I stated they wo u ld have to be exact same pistons.

trik396

iTrader: (4)

I did not realize stock Ls6 pistons were cast. My fault

handyandy496

iTrader: (9)

just number and weigh each piston and make Shure their the same weight as the new ones.

GNon18s

You mean if the stock pistons I remove vary in weight, just make sure the new pistons vary the same amount? ..like if no.2 piston is xx grams lighter than the no.3 piston, make sure it goes back together the same way with the new pistons? This motor only has 13k miles on it so I was really hoping not to have to rebuild the whole bottom end. Just wanted to do forged pistons and ARP rod bolts to get it back on the road.

PREDATOR-Z

Guys, assembly needs to be balanced. That is just the way it is done.