Just getting started on the repowering of a 1971 Peterbilt. It's original 1693TA began leaking coolant into the oil, sustained a cracked head and six bad pistons on the top side alone. The plan is to perform some various general upgrades and repairs on the tractor while removing both engines. 3406c rebuilder yet to be determined. Perhaps a vocational school HS class that would, presumably follow thread and benefit immeasureably watching the truly fine mechanics that contribute their expertise at 'TheDieselGarage.com. The 1693 Caterpillar will be saved and eventually rebuilt as well. Photos of the '71, the donar with swap engine pics will follow shortly.