+.040in. Dome Top Pistons with 8.3:1 Compression Ratio. Fits Big Twin 1978-1984 with 1340cc Shovel Engine. AN-10102-203-6130 * Will Not Fit Rocker

* Will Not Fit Rocker Models

Chieftain Limited

020" Rubber Coated Steel Cylinder Base Gasket

* Machined step to 1" for stock risers

* Replaces OEM # 27170-89

+.040in. Dome Top Pistons with 8.3:1 Compression Ratio. Fits Big Twin 1978-1984 with 1340cc Shovel Engine. AN-10102-203-6130 * Will Not Fit RockerFeatures & Benefits: * Bore = 3. 538" * Stroke = 4. 250" * 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