Not to high jack your thread but what if we throw a 440 block in for comparisons sake? My current 440 has developed a knock in the bottom end so this thread is where I am as well in the research stage such as the OP. Same money to build a 493 as a 512. What about oil pickups? Will the 1/2" pickup work with a 4.25" stroke? Pin in the oil ring with a RB block?
