I have a 1981 2F engine that I opened up and have found is in pretty good shape. I have taken the cylinder head off and taken it in to be cleaned, resurfaced and tested and it is in great shape. Since I have everything opened up I figured I should go ahead and replace the bearings. What I am wondering is how do you determine the size of the bearings? And where is a good place to purchase bearings (main bearings, cam bearings, rod bearings)?