Happster's '72 scamp build!

Look for small bolt pattern wheels in the For Sale section of this site. Also post a Parts Wanted ad. 4" bolt pattern is not very common, but on this site, you'll probably find a few sets.

I understand what you're thinking about main caps. I thought the same thing. You need to know how they're fit, though.

The block and caps are machined while bolted and torqued together. The caps are numbered so they always get assembled in the proper place. If you move cap #3 to main saddle #2, the bore in the cap will not line up perfectly with the bore in the block. You're only working with .002 bearing clearance - the thickness of a hair. That alignment is critical.

If you come across a set of caps, I'm told it's possible to mill the caps slightly on the surface that mates with the block. That makes the bore slightly oblong, and slightly undersize. Then you get the thing line bored. That gives you the proper alignment and size again. The only thing I don't understand about the procedure is what they do about the width of the mains. That dimension is already at size and there's no material to bore in that dimension...

Anyway, I thought you should know that. Depending on what the machine shop charges, you might be better off finding a good used block with caps.