Keith Black Pistons KB258.010 +.010" Flat Top Pistons w/8.6:1 Compression Ratio for Big Twin 84-99 w/Evolution Engine • The strongest studs &

• The strongest studs & bolts available

(Delphi Ignition Systems or carbureted)

• Modeled after the early 90's Off-Road racing pattern

and synthetic nubuck

Keith Black Pistons KB258.010 +.010" Flat Top Pistons w/8.6:1 Compression Ratio for Big Twin 84-99 w/Evolution Engine • The strongest studs &Features & Benefits: * Bore = 3. 508in. * 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 # 21942 83 Tech Tips: * 8. 6: 1 Compression Ratio with 80cc Head Chamber Volume. * Follow Ring End Gap & Piston to Cylinder Clearances as per the