As low as $104.83/mo with or . (Pay in 4 interest-free payments)
KB PERFORMANCE Super-Duty Big Bore Piston Kit (124") Upgrade your engine with the KB PERFORMANCE Super-Duty Big Bore Piston Kit , engineered for strong street performance and reliable combustion. This forged piston set is designed to work with a 4.250" bore cylinder (sold separately) to help deliver a targeted 11.4:1 compression ratio for responsive power. Key Features Valve pocket design supports intake/exhaust valves up to +4.00 mm oversized Type 3 hard-anodized crown for corrosion resistance when using alcohol-added fuels Type 3 hard-anodized top ring groove helps resist micro-welding and maintains a hard-flat ring contact surface OE-style round wire locks for straightforward installation Heavy-duty wrist pins with true 0.9270" diameter for correct rod fitment Line2Line AST skirt coating starts with near-zero clearance and hones to form the proper oil wedge for ring seal , piston stability , and quiet operation Kit includes pistons, rings, pins, and locks Specifications Model: Super Duty Product Type: Big Bore Piston Kit Bore: 4.250" (Oversize: +0.005" ) Compression Ratio: 11.4:1 Piston Style: Domed Stroke Length: 4.375" Displacement: 124" Piston Material: 4032 Aluminum Alloy (Forged) Riding Style: Street Fitment Note: Requires 4.250" bore cylinder (sold separately) Weight: 3.15 lbs
Valve pockets are designed to accept up to +4.00 mm oversized intake and exhaust valves
Type 3 hard-anodized crown offers corrosion resistance for alcohol-added fuels
Type 3 hard-anodized top ring groove eliminates micro-welding of ring to the groove and gives a hard-flat surface for ring to rotate on
OE-style round wire locks are easily installed
Heavy-duty wrist pins with true 0.9270” diameter to fit rods correctly
Line2Line AST skirt coating starts out with a near-zero wall clearance and through the break-in period hones the cylinders to produce the correct oil wedge, keeping the piston square to the cylinder for best ring seal and quiet operation
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