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Diamond Racing Pistons SBF 3.250" Stroke Nitrous Pistons w/ High Port V.P.Various Bore Sizes1.165" Compression Height (Must use 5.400" rod)11.2cc Dome3D milling on piston crowns for ready to install finishDome designed to work with most TFS HighPort cylinder headsTop ring down dimension: .325"Ratios figured for .041 head gasket @ 8.200 DeckPremium ring package .043 x .043 x 3/16 ring packageVertical gas ports for better ring sealPremium H-13 .185W wrist pins includedValve pocket depth: 0.300" intake and .250" exhaustWill work with up to a intake valve size of 2.125" and exhaust valve size of 1.625"Made from 2618 alloy and designed for small-medium nitrous levels (Up to 450HP)