greasess

iTrader: (1)

I've been trying to find dimensions for the new LT6 flat plane crankshaft. I know the stroke is 3.15 inches and the engines bore spacing is 4.4 inches. I'm looking for journal diameter, width and spacing. The end goal is to put a flat plane crankshaft in an LS block. Nobody involved in this undertaking is under any illusions about this being simple, easy or the best way to reach a given power goal. Our options at this point are a custom crankshaft from one of the usual vendors, machine one from a big block of 4330M in one of our shops or maybe get lucky and be able to use a LT6 crankshaft with some modifications. Any information you have would be greatly appreciated.

G Atsma

What do you see as advantages in the flat crank?

spanks13

iTrader: (5)

It is completely different design.

Found on corvette forum

For what I bet would be less money than GM would sell you an LT6 crank you can just buy one from Bryant Racing or other custom crank manufacturers.

https://bryantracing.com/

Chris_B

Over a year ago I talked to Crower about exactly this. I even modeled one up in Solidworks (also did one for an LT4). They said budget for about $2500 for any custom LS or LT crank, flat or otherwise. Of course, you'll also need a custom cam grind. Comp Cams says around $900 or so, regardless of firing order. The rest is some tuning software tweaks, lightest possible rods you can find, and lots of self-locking fasteners, Loctite, etc., to hope it all stays together...