This Came in my Boat...
Here's what I was told ...
LS6 4 Bolt Block
LS6 Forged Crank
Built by SoCal Speed and Marine in Late 2007 and had 21hrs on it when i got the boat.
Here's what I Know ...
LS6 4 Bolt Block "C 23 70" Date Code
Had 80psi at Idle and ran Excellent when Pulled
I put about 15 Hours on it
All gaskets looked newer and had newer looking ARP Head Bolts
Has a Dooley 12qt V-Drive Pan on it with drain back tubes for Twin Turbos
Come inspect it for yourself ... Located near Apple Valley, CA.