{"product_id":"stage-4-extreme-2-5l-subaru-closed-deck-short-block","title":"Stage 4 EXTREME 2.5L Subaru Closed Deck Short Block","description":"The IAG Performance Stage 4 EXTREME 2.5L Subaru Closed Deck Short Block is a professionally built and assembled engine block engineered to withstand higher boost pressures and power outputs, making it an ideal choice for high-performance street or dedicated race vehicles. It is constructed from brand new Subaru OEM case halves that have been converted to a closed deck design for enhanced strength.\n\nKey specifications include a 99.75mm bore size, a 2.5L displacement, and forged aluminum pistons. This short block is fitted with IAG-Spec JE FSR pistons, .250″ \/ .927″ H13 performance wrist pins, IAG Spec Tri-Beam connecting rods with ARP625+ rod bolts, ACL rod and main bearings, and a Manley Billet Turbo Tuff Crankshaft. It is machined to accept 14mm head studs, which are sold separately.\n\nThe compression ratio can vary depending on the cylinder heads used: 8.2:1 is achieved with B, V, and W cylinder heads (EJ257), while D cylinder heads (EJ255) result in an 8.5:1 compression ratio. This build requires IAG Fire-Lock Head Gaskets for optimal performance in high boost applications. The engine is blueprinted and assembled with precision, utilizing a Haas VF-4SS mill for the closed deck inserts and final finishing touches for the IAG Fire-Lock head gaskets.\n\nThis short block is compatible with 2002-2005 Subaru WRX, 2004-2014 Subaru Impreza (including STI models), and 2004-2013 Subaru Forester models. It is specifically designed for EJ257 engines and may require specific cylinder heads for the stated compression ratios.","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":52688780132664,"sku":"IAG-ENG-1453","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687905009.webp?v=1784895753","url":"https:\/\/store.motormia.co\/products\/stage-4-extreme-2-5l-subaru-closed-deck-short-block","provider":"MOTORMIA","version":"1.0","type":"link"}