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Completely forgot about that.This just occured to me. A B20 has an 84mm bore and a B18 has an 81mm bore. I'm pretty sure that it's going to be a problem having the combustion chambers 3mm larger than the cylinder bores.
I think the P8R is the only one that has the 84mm combustion chamber- otherwise the B20 head should be the same 81mm size as the rest of the B18 heads. If you do have the 84mm combustion chamber head, do NOT use it on the 81mm bore! Don't toss the P8R head if you have it though- it's very sought after in the non-VTEC community.