I also have a feshly built up LSX for sale. Block has 52k but the pistons have been flycut. I have over 4k invested into this motor, taking a loss at 4k. Here are the specs capable of 420+ RWHP with proper tune.

Flycut Pistons

LS6 Block

LS6 Intake

LS6 Oil Pump

LS2 timing chain

LS1 heads stage II ported with Manley Valves and Manley double valve springs

Torquer V2 112lsa Camshaft

ARP head bolts

ARP Rod bolts

.40 Cosmetic head gaskets

If interested please call or respond 512 749-6664