Ok, I've got a B20Z block, and an LS crank and LS main caps. I know that the LS and B20 cranks are exactly the same, but can I use the LS main caps without any problems? I don't have the B20 main caps....
I've always been told not to mix/match main caps from other engines because of how they're cut, but I don't know if that's really a big deal. You might want to send the main caps out with the block to the machine shop and have them inspect them- if there's any kind of problem between the caps and journals, you could probably have them resurfaced or something. Then again, I'm talking out of my ass here... I don't know if you should use the other caps or not.
I knew styleteg would chime in on this one. In any case where you have to switch caps between different motors, whether it be cam caps or main caps, you have to get them align honed. Depending on how well you know the machinist that agrees to do that work for you, it might be cheaper just to get another block, that already has the main caps.
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