Thanks Curt, I too was under the impression that most suppliers over look any thing bigger that a 1ton truck, they don't deal w/any other medium duty truck parts, so why bother with the motor parts. My next ? would be, will the same ring set work in the pre-'54 235's as is used in the '54 and up high pres. oiled 235's or did they change piston design in this "new" era?