Outside diameter is 12 3/4" for years 1955-85. Crank Flange bolt pattern: 3.58"; clutch dia.: 10.4"; starter ring gear teeth: 153. Lightweight nodular iron flyweel. Weighs approximately 15 pounds. For two piece crank seal small block chevy.....internally balanced. This flywheel is brand new in the box and has never been installed. After I bought it I decided to go with a big block. Sell new for $175-185 and I'll take $125 + shipping!!
You can check your application at this link:
http://store.summitracing.com/partde...0&autoview=sku