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KB PERFORMANCE Hypereutectic Piston Kit (103" Twin Cam / 96" Big Bore) Upgrade your engine with the KB PERFORMANCE Hypereutectic Piston Kit engineered for tight tolerances, excellent ring seal, and long service life. Designed for a 3.875" bore with +0.010" oversize and 10.0:1 compression ratio , this kit is built from high-strength hypereutectic aluminum for reliable street performance. Key Features Made from T-5 heat-treated 390 hypereutectic aluminum alloy Precision fit helps promote longer piston and ring life Diamond-machined pistons held to ±1 gram weight consistency and < .0005" piston-to-piston tolerance Kit includes two pistons, pins, spiral-lock pin clips , and Hastings moly rings Rings/pistons sold separately: replacement piston rings are not included Can be installed tighter than other pistons to reduce piston rock and improve ring seal Important: follow included guidance for top ring end gap and correct clearance Specifications Application: 103" Twin Cam, 96" Twin Cam Big Bore Product Type: Piston Kit (Units: Kit) Bore Size: 3.875" (+0.010") Compression Ratio: 10.0:1 Stroke Length: 4.375" Piston Head: Flat Top Piston Material: Hypereutectic Alloy Ring Material: Moly Coated Displacement: 103" Riding Style: Street Weight: 2.66 lbs
Manufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloy
Allows a tighter fit and longer piston and ring life
Diamond-machined pistons are held to plus or minus one gram weight and less than one-half-thousandth-inch (.0005") tolerances from piston to piston
Each kit contains two pistons, pins, spiral-lock pin clips and Hastings moly rings
Replacement piston rings sold separately
KB pistons can be installed tighter than other pistons. This results in less piston rock and better ring seal. Please read instructions included with piston for correct piston clearance.
Due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap. Please read instructions furnished with piston for correct ring installation.