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I have yet to see a steel crank motor with heavy rods unless someone put them there and I don't mean the mfg.



Just finished an original nm 71 GTX engine that had flat tops heavy rods,6 pack damper and a steel crank.Ext balance.

Manual trans 440 trucks were steel cranks and heavy rods.Not sure how long but likely until the service supply ran out.

Leave the gun.......take the Cannoli's....Mike