This engine was completely rebuilt by US engines Inc in 2012. Only used it about 30 hours since. I pulled it out with the intention of changing coupler and a 4 barrel upgrade. While it was out , I pulled both heads and had my local machine shop go through and overhaul heads again. I bought a new set of 12 roller lifters and installed. I honed all cyls. and installed new rings .040 over. Put it all together per mercruiser maintenance manual and then I bought a 5.7 v8. Now this 4.3 is for sale. It has aluminum exhaust manifolds I bought in 13 that have only a few hours on them. It has Delco Voyager ignition also practically brand new. 2 barrel carb (Guaranteed Carburetors Inc) only 1 outing on it. Water pump new in 2012. Electric fuel pump new in 2013. The engine is in south Jersey and will entertain any reasonable offers. phone 856 466 0486