>ok ive got some domes laying around on stock 350 rods will they fit in the 4.3? i >thought i heard that something with the rods is different.

If you're refering to the 4.3L V6, yes, they are different. They have 2.250" diameter rod journals instead of the 2.1" used by the 250

>and are refurb'd motors usually bored out??

Yes.

>and is it true you can buy oversized rings to use stock bore pistons in a overbored >cylinder?

No.

Bob