So I had to rebuild my crv motor and was wondering if the crankshaft and bearings were all the same size in a b20z2 motor and in a b20b4 motor. Due to lack of funds i have to try to piece together a working motor out of two different ones.

 

Ill advised but check the block and crank for bearing size stampings. Should be A-D on the oil pan rail and 1-4 on the crank. Same for rod bearings, A-D on the crank and 1-4 on the rods. There is a matrix for size. Bearings are colored by size with a paint mark on the edge. That paint is probably long gone or discolored by now.

 

Download or get a copy of the factory service manual. It will mull answerall your questions regarding a rebuild