KEITH BLACK PISTONS Std Dome Top Pistons with 8.3:1 Compression Ratio. Fits Big Twin 1978-1984 with 1340cc Shovel Engine.

Description

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 # 21990-80

Tech Tips:-

* 8.3:1 Compression Ratio with 117cc Head Chamber Volume.

* Follow Ring End Gap & Piston to Cylinder C