Originally Posted By tex013
Ok
I broke a stock block now am looking at aftermarket .
I have a unused World block I can buy . Here in Oz !
It is a 4.310 bore still in crate .
What if any issues should I be aware of ?
I will use my current 4.25 crank , rods etc and go to 4.350 bore
thanks in advance

Tex


I'm not sure I'd stop at 4.350 unless you already have pistons. Lots of piston choices at 4.375 which still leaves you with 0.125 for future rebuilds. That block should be good for 4.500 if not a little over that.