If I do a 451 I'm wanting to grind the crank counterweights by hand. Fixed income, and nobody around here does it. Journals yes,counterweights no. I saw an article on a low buck 451 build... But can't find it now. The guy said he hand ground them, dunno. I've just put in a couple of 440's long ago and let it go at that. I have 2/400's and 2/440's.so I could go either way. Just asking for opinions. Trust me I'm taking it all in.