I've used those blocks on several motors I've built to replace the 426 W blocks that where wore out. I have one in the shop now that I sonic tested last week, I will bore it from stock(4.170 or maybe there 4.180 stock confused) to 4.250 and use a Mopar 4.150 stroke crank with stock Mopar rod journals and a set of Eagle 6.800 long Mopar H beam steel rods with a set of custom pistons to make a pump gas motor for my 1963 Plymouth Fury up
It sonic tested okay, it won't go much above 4.25 safely though whiney shruggy
I had the stock steel crankshaft offset ground down to 2.200 and increased the stroke to 3.910 for a 440 motorhome motor I have to make another 464 C.I. pump gas stroker with aluminum heads to sell up

Last edited by Cab_Burge; 12/09/17 03:38 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)