Quote: I am not Jerry, but 6.1 block I bought came fully machined from dodge dealer.
Thanks Rick. Is the 6.1 a direct replacement for a 5.7 with different pistons, or what else changes? I have an early 5.7 now, but have a good stroker crank and rods.
Same stroke 3.58. 6.1 is forged. Bores are different 3.92 for the 5.7 and 4.55 iirc for the 6.1. The 6.1 has floating piston pin.
The factory 5.7 has a 3.917 bore and the 6.1 has a 4.055".
I might add that with the early blocks, the quality was exceptional..you really didn't have to do anything to them if you could live with a .002" difference in deck height and maybe touch up the cylinders with a plateau finish hone depending on ring choice. With the later blocks I would highly recommend to align hone the main bearing housing.
