King Nothing

iTrader: (9)

I'm looking at my options for a crank in a LM7, size and brand and why. I'm going with a 3.898 bore so it will at least be a 346ci. Motor will see boost btw, 8-12lbs and with have 317 heads and I'll run 9.5:1 compression

Blk98Vert

iTrader: (2)

Rebalance the stock one with the new rotating assembly. They are good for over 1000 at the flywheel

King Nothing

iTrader: (9)

i've thought of that but if the shop ***** up on rebalancing the crank and the engine goes to **** i'll be very unhappy. i can have it looked at i suppose or i could go with a 4" if i want a 383 hmmm

MikeFSKSpeed

iTrader: (37)

If interested I deal with Manley, Lunati, and Crower for forged high quality Cranks!

King Nothing

iTrader: (9)

pm sent

remauto1187

iTrader: (1)

Have you dont this? If so how much did it cost.

I would think that it would be very expensive since they would have to ADD mallory metal and alot of it to rebalance for a substantially higher weight piston.

S10xGN

iTrader: (11)

Hmmm, I would think an aftermarket piston would be lighter than a factory slug, and either way not enough to make a substantial difference in bob weight...

bww3588

iTrader: (49)

Depends. When I had a stock 5.3 crank balanced I believe the forged pistons of the larger bore (3.838 vs 3.780) were very close to the stock weight of the 5.3 pistons...closer than stock vs stock anyways. I was charged 150 bucks to re balance.

chrisfrost

iTrader: (8)

Yes stock LS1 pistons vs. LM7 pistons not very much difference maybe 2 or 3 ounces total difference .

driver56

That's pretty substantial since 1oz is roughly 28 grams, we balance rotating assms. to less than .5 gram on a Hines computerized balancer.