88 Ford
Full Access Member
Justin was building a 6.9 and blew a head gasket iirc. He then tried to machine the block to accept 7.3 studs and ruined the block. After that he re-ringed a stock NA 7.3 and threw it in his Bronco. That is the engine that he dynoed 400hp/800wtq with. It was essentially all bolt ons and head studs. After the dyno, he upped the boost a bit and thats when he found the weakness in the bottom end. If I had to guess he was probably closer to 450hp at that point though. Anyway my point is that the stock bottom ends are pretty strong and IMO capable of 350hp reliably. But again that is just my opinion. Some may think 300hp is the top end. As time goes along we will know for sure.