Had some problems with my recent rebuild on my stage 1. The #3 main bearing on the cap side showed copper after only a few hundred miles of use. The crank checked out ok but the main clearances on the block ranged from .0004" to .0008 out of spec.. (This block was already machined when I purchased it and the mains line honed)It was explained by my machinist that honing should not be used on the mains because it is difficult to control. He showed me that several of the caps had what looked like a cup appearence ( could see this effect where the assembled caps meet the block, it did not have a straight demarcation line) He prefered line boring which does not give the nice cross hatched pattern but can hold a tolerance across the mains of .0001". Also when he sets up for line boring, he positions the cutting tool to remove the majority of material from the caps.
Any thoughts or experiences?
Jeff
Any thoughts or experiences?
Jeff