The machine shop did the machining only. Assembly was done in house by friend. Again, engine specs, factory 1970 440 HP, externally balanced (from factory), heavy rod motor, automatic. Only major change was using Sealed Power 2355 pistons, to keep compression, as 2266's are junk low comrpession. Engine was not rebalanced.

By the way, I just rebuilt my #s matching 71 GTX engine, with heavy rods, and same combination (2355 pistons, no rebalance), and its probably the smoothest 440s I've ever owned.

I just want to be sure which flywheel to use.