These pistons were originally designed by Keith Black
Manufactured from high-strength, T-6, heat-treated, 390 hypereutectic alloy
Allow 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, spiro-lock pin clips and Hastings moly rings
Piston pin lock rings available separately
Replacement rings are also available separately
Made in the U.S.A.
NOTES: 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.
Each replacement ring denotes rings for two pistons, except 48-99 Big Bore kits and 99-06 88” Twin Cam kits, which require two sets.
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