I have almost all the parts except my block is a 50mm mains and the crank is a 55mm. Is that something a machine shop can just line bore and be done or is this a big problem.

 

you can have them line hone your journals out to 55mm, just be sure to get a good shop as they could easily mess this up.

If it was me, I'd get them to do that job and install bearings and the crank, that way if you have a problem, you can come back to them w/it.

 

thanks i just wanted to make sure.