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Inner & outer
• Includes copper
• Made from 1144 stress-proof steel
You can select from multiple formats so that AFR data is displayed with the same RPM rows and throttle position sensor (TPS) or manifold pressure (MAP) columns used with most engine mapping systems
• Polished allen screw kits
Keith Black Pistons KB297.040 +.040" Dome Top Pistons w/8.3:1 Compression Ratio for Big Twin 78-84 w/1340cc Shovelhead Engine Inner & outerFeatures & Benefits: * Bore = 3. 538in. * 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. Tech Tips: * 8. 3: 1 Compression Ratio with 117cc Head Chamber Volume. * Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers