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Quote:

Line boring only affects the crank main bores , the cap mounting face does not get machined .



Could you elabotrate? I cant picture this. Seeing it done looks like you expand the entire "bore" of the crank bearings. Does this neccesitate oversized OD bearings? Why do they sell undersized timing chains? Thought the crank was actually higher in the block now (installed)



the only part that is machined is the hole the crank sits if , some material is taken off the face of the CAP to make the hole egg shaped the the hole is rebored round . The surface the caps sit on in the block does not get machined so the rear main is not in same exact place as the main bores , it gets very expensive and labor intensive to machine the seal bore , never seen it done .

Normally you don't need a shorter chain when a block is relined bored for main studs , it's when you spin a bearing or so other major issue that one would need a shorter chain.