Diamond Racing Forged Pistons Set Subaru WRX STi EJ257 99.5mm STD -4.5cc 9.9:1
is backordered and will ship as soon as it is back in stock.
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Description
Specs
Bore Diameter 99.5mm (STD)
Compression Ratio 9.9:1
Rod Length 5.137in / 130.5mm
Stroke 79mm Standard
Pin .905in x 2.500in x .180in
Piston Features:
3D milling on piston crowns for ready to install finish
Offset pins for quiet operation
Moly skirt coating for friction loss and skirt wear protection
Ratios figured for 101mm x .0236 head gasket
Top ring down dimension: .250"(1.208cd) - .240" (1.129cd)
Premium 8620 .180W wrist pins chamfered for roundwire locks included
Premium 1.2mm x 1.2mm x 2.0mm ring package included
Oversized valve pockets - for larger than stock valve sizes
Valve pocket depth: 0.220" intake and .220" exhaust
2618 material for High HP/Boost applications
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