318 build up

JohnWayne said
With futher investigations of the forged crank, I belive it came out of a 273. The casting numbers is very hard to see, but the two first ones is 21. According to my books that would be a early 273 crank.

The bearings do not look very good at it. A polish would not be enough. Then, someone has been welding the balance drilled holes in it. If a real enigne-shop has done it, that would be ok, I guess. But if someone did it at home.....

Arentbyou supposed to press in slugs made of mallory metal to rebalance??

Typically, yes, but only if you need more weight than a little bit of welding can't cure and naturally, that all depends on the parts chosen. Using light pistons like the KB 167s should work well with 273 light duty stuff, and it'll keep down the bobweight (less parasitic hp loss). I've received engines back from reputable shops with weld marks on the counterweights--cast and forged cranks alike...if they only need a couple grams, it's significantly cheaper to weld than buy/add the mallory. You should be able to tell if it was done correctly...if the welds look like a rack of dimes, you're good, if it looks like someone laid on blobs of slag, you might want to have that addressed.