keene1bj said:the ls1 is smaller from head to head but the ls1 block is five inches longer than the nsx engine. A complete ls1 engine dressed and oiled is 457.6 lbs, the new ls2 is 443 lbs
something else i just found on ls1tech.com
"TOTAL, COMPLETE, FULLY DRESSED, FULLY OILED, crate ls1 from GM is 458#s
This is with manifolds, and a clutch.
Clutch tips the scales @ 49#s, and the cast iron manifolds are 13 each. Subtract this from the motor, and you get 383#s, with oil, intake, coil packs, Water pump, pan, filter, TB, you name it, sans manifolds and clutch. Not bad!"