Engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strengthArmorGlide? Skirt Coating: seizure resistant, friction reduction, and quieter operationFully machined crown featuresPrecision ring grooves, anti-detonation groove, and additional ring seal improving featuresForced pin oilingDesigned and built to withstand heavy to severe duty performance applications. Professional Series forged racing pistons from Wiseco are no-expense-spared pistons designed for the serious racers and builders. Packed full of custom-level performance and durability features and provided with premium rings, Professional Series pistons are designed and built for use in heavy to severe duty race builds. Remove your limits with Wiseco?s Professional Series.. Wiseco Honda K20A Piston Set, 86.50 mm Bore, 30.00 mm Compression Height, 0.866 in. Pin Diameter, Sport Compact, Set of 4.. Wiseco 02-06 Acura/Honda K20/RSX-S 86.5mm Bore .020 Oversize 11.0:1 CR Dome Dish Piston. Piston Set, Honda, K20A, 86.50 mm Bore, Sport Compact, Set of 4. Honda K24 w/K20 Head +5cc 12.5:1 CR. Engine Piston Set. Honda K20A/Z. Piston Set

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