Keith Black Pistons KB258.STD Standard Flat Top Pistons w/8.6:1 Compression Ratio for Big Twin 84-99 w/Evolution EnginePistons; BT'84 99 STD 8. 6: 1 "Flat Top" Evo Motor Product Details Features & Benefits: * Bore = 3. 498in. * Stroke = 4. 250in. * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter piston to cylinder clearance. * Complete kit includes: two pistons, rings, wrist pins and clips. * Replaces OEM # 21940 83 Tech Tips: * 8. 6: 1 Compression Ratio with 80cc Head Chamber Volume.
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Keith Black Pistons KB258.STD Standard Flat Top Pistons w/8.6:1 Compression Ratio for Big Twin 84-99 w/Evolution Engine