The ones I bought arre top of the line for this year engine. All indications from researching is that its a 2006 crate motor that someone started to rebuild with some top of the line GM aluminum heads. These are the parts you are looking at in these three pics. Parts let to go on....
Vortec 7400 engines were the final version of the 454 used in production vehicles or trucks. However, Chevy still offers the 454 big block V8 as a crate engine. You can source the454 HO directly from Chevrolet. Despite the 454 being introduced nearly 52 years ago this crate engine still sh...