3620301+ Subaru EJ257 2.5L DOHC WRX STI 2004-UP, 3.920" (+.0025"), 8.6:1

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Subaru EJ257 2.5L DOHC (+.0025")
    WRX STI 2004 and up
Stock Bore: 3.9175, 99.5mm   Stroke: 3.110   Rod: 5.137   Head cc: 51.0   Gasket: .050   Deck: ~.012
Bore Comp. Dome Compression RatioComp. Gram Part Required
in/mm Height CC w/ Stock Head  Wt. Number Ring Set
Dish top           Turbo/Nitrous
3.920 / 99.57 1.208 -16 8.6 406 3620301+ 1215283917

 

Requires cylinder hone only, no boring

Offset pin hole