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IAG Stage 3 EJ25 Closed Deck Case - 1/2" H.S.M. 99.75mm Bore & Hone - WRX/STI/LGT/FXT

IAG's Closed Deck converted case halves were created to be the most affordable and cost-effective short block modification for EJ25 Subaru turbo engines. The deck surface is machined to accept specially CNC’d cast inserts that strengthen the weakest point of the OEM case at the upper sleeve. The case halves are then CNC drilled and tapped to accept 1/2 inch head studs that greatly reduce head gasket failure during high cylinder pressure scenarios. The case is bored and honed to 99.75. . . Show More >



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