5046 posts · Joined 2007. #2 · Oct 26, 2020. Why not rebuild the 6.1? You can rebuild it better than a stock 6.4. You'd need to solve for the intake manifold (you could re-use the 6.1), get the cam phaser lockout, tune shouldn't be that hard, and don't recall the front cover and accessories.
. 402 178 443 218 466 252 133 100