I am changing my block on a b18b, because it developed a crack drilling out a bolt on it. Basically I will be taking all the internals of the cracked block and pla\cing them in the new one along with the head. Now my questions is; is it neccessary to replace rings and bearings and head gasket, if they are in good condition?

 

why not replace them?? its cheap insurance against having spun a bearing or something else going wrong and having to replace the bottom end again.. sure they may measure up to specs and all, but i would definitely replace them anyways..

 

The headgasket and rings are required to be replaced. The bearings are optional, but I would definitely consider it.

 

Why cut corners with the block torn appart anyway? You'll deffinately appreciate doing it now rather than start burning/leaking oil down the road. Always, Always replace rings & gaskets when you have your enigne appart too. I would replace the bearings too but thats just me.

 

Do it once, do it right, replace them