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Instruction Sheets for Part Number UEM-KB333-040
Pistons, Hypereutectic, Flat, 4.040 in. Bore, 1/16 in., 1/16 in., 3/16 in. Ring Grooves, Ford, Set of 8
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Estimated Ship Date: Apr 9, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
KB333.040
Part Type:
Product Line:
Summit Racing Part Number:
UEM-KB333-040
UPC:
800745067630
Piston Rings Included:
No
Bore (in.):
4.040 in.
Bore (mm):
102.616mm
Stroke:
3.500 in.
Engine Stroke Type:
Stroked
Rod Length:
6.580 in.
Piston Style:
Flat top, with two valve reliefs
Piston Material:
Hypereutectic aluminum
Compression Height (in.):
1.160 in.
Piston Head Volume (cc):
+6.50cc
Wrist Pin Style:
Press-fit or floating
Wrist Pin Retainers Included:
Yes
Wrist Pin Included:
Yes
Pin Diameter (in.):
0.927 in.
Piston Ring Thickness:
1/16 in. x 1/16 in. x 3/16 in.
File Fit:
No
Gapless:
No
Remanufactured:
No
Quantity:
Sold as a set of 8.
Notes:
Spacer ring included.
KB Performance Pistons
KB Performance hypereutectic pistons are made from 390 aluminum alloy and heat-treated to T6 standards, which makes them 30 percent stronger than ordinary untreated hypereutectics. Their 100 percent CNC-machined crowns, high upper compression-ring location, gas-accumulator groove, drilled oil returns, and spiral-lock retainer grooves make these pistons outstanding for performance applications. They have a lightweight, rigid-rib skirt design that stabilizes the piston in the bore. All of this adds up to pistons that fit tighter than forged types, provide improved oil control, reduce blow-by, increase ring life, eliminate cold start-up knocking, and won't cost you an arm and a leg! Thousands of models are available—find the set and options designed for your vehicle and engine application.
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