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According to Diesel Power's article on the Ford IDI's: 1200hp.

Think idi can't make big horsepower?Back in the early 1990s, max Lagod of Hypermax put together an extraordinary engine package for a customer yearning to compete in sled pulling. With nothing holding him back, Lagod designed a 7.3L that included two Garrett turbos (which were state-of-the-art then but probably not manufactured anymore), a Bosch inline P-pump, custom injectors, a fabricated intake and exhaust manifolds, and slight cylinder head work.

Surprisingly, much of the factory engine components were retained, such as the crankshaft, block, and pistons-although the connecting rods were heat-treated. Compression on the engine was 15:1, which called for ether-assisted startups. Soon after entering this wild IDI into area-sanctioned sled pulling events, the engine was banned. Not to be discouraged, the owner turned to drag racing. Rumor has it that the truck graced with this 7.3L beast put out 1,200 hp and ran quarter-mile times in the 9-second range!

All of that power came with a price though, as the engine was infamous for its unreliability. Apparently, the engine block flexed so much on several occasions that the rear of the engine block broke off and required the utilization of rubber freeze plugs!

Heath