Quote: Ok I have a few questions.... what was the difference between the 08 and the 09 engine... for some reason I get the drift that the 08 is the better engine to run as a carb engine.... the reason I ask is I would like to build up a twin turbo gen 3... what parts are interchangeable between the 08 and 09... or the 5.7 and the 6.1 .. also how do the bores stand up for wear.. I can pick up a 04 5.7 real cheap BUT it has 120K on the odom.... any thoughts
An 08 is a non VVT engine, same engine used from 03-08, an 09 is VVT, they use different cams which are not interchangeable. The 09 heads are better, probably 30-40 cfm better and are interchangeable. The cranks can physically interchange but the tone rings are different, not that u would use a stock crank with a turbo anyway. It sounds like the 04 block would be the one to use, more cam selection, and apparently the earlier blocks have better wall thickness. 120 K wouldn't be a huge worry, which modern rings and fuel injection the bores are probably fine