318 Steel Crank Motor

This comes up all the time, the 340 cast crank external balance has a " cast crank only" balancer. The 318's use a neutral balancer. It's a great little motor and all of them are internally balanced. All stock 360's are externally balanced and some 340's are too. The harmonic balancers have a machined groove partially around their perimeter. Good luck with the sale, it's not a bad price for a rebuilt 318. The steel cranks have a wider casting part line, a machinist once showed me a trick. They ring when tapped ( it's got to be out of the block) and cast ones thunk. Also you can check the Numbers on the crank for ID. Why don't you stroke it to 390 Ci, that would be cheaper and just as cool. Tell everyone it's just a teen!