Kool, later model truck engines from about 87 up had the size cast into the b/house mounting flange near the head in back. Or, on front near right head is block surface with the stampings with letters and date. Use letters to call a dealer or the Mortec site above and it wil tell you size, year, and trans was used with and sometimes the HP and carb set-up. I'm thinking the balancer was smaller on the later 305's, can't remember for sure. Where's all your rodder buddies when you need questions answered? :p

G.L. Grumpy's
Old Iron Ranch
Huntington, IN 46750


MM R tractor, Speedex
and Power King tractors