1968-1970 chev corvette/ camaro 427 2 bolt main block Std, Casting number 3983512 (512) block. with (3804816) nf cast crankshaft, special hi- performance TWR L2268 (non scoff) Pistons std.300 dome. Stock rods. Can be built as a short block. best offer, call frank at 1-403-808-3900 best offer