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KB Performance Pistons

4.45 out of 5 stars 137 Customer Reviews

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
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, elimin
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.

Results 1 - 25 of 139

Pistons, Hypereutectic, Flat, 4.070 in. Bore, Dodge, Plymouth, Set of 8

Part Number: UEM-KB243-030

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Pistons, Hypereutectic, Flat, 4.040 in. Bore, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB107-040

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Pistons, Hypereutectic, Flat, 4.280 in. Bore, Chrysler, Dodge, Jensen, Plymouth, Set of 8

Part Number: UEM-KB162-030

5.0 out of 5 stars ( 1 )

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Pistons, Hypereutectic, Flat, 3.940 in. Bore, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB167-030

1.5 out of 5 stars ( 2 )

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Pistons, Hypereutectic, Step, 4.320 in. Bore, Chrysler, Dodge, Plymouth, Jensen, Set of 8

Part Number: UEM-KB236-STD

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Pistons, Hypereutectic, Flat, 4.000 in. Bore, Chrysler, Set of 8

Part Number: UEM-KB107-STD

3.0 out of 5 stars ( 2 )

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Pistons, Hypereutectic, Flat, 3.910 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB167-STD

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Pistons, Hypereutectic, Dome, 4.310 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB400-060

5.0 out of 5 stars ( 1 )

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Pistons, Hypereutectic, Flat, 4.030 in. Bore, Chrysler, Set of 8

Part Number: UEM-KB107-030

4.5 out of 5 stars ( 2 )

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Pistons, Hypereutectic, Dome, 3.940 in. Bore, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB399-030

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Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Flat, 4.290 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB162-040

2.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Pistons, Hypereutectic, Step, 4.320 in. Bore, Chrysler, Dodge, Plymouth, Jensen, Set of 8

Part Number: UEM-KB237-STD

Not Yet Reviewed

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Pistons, Hypereutectic, Flat, 4.270 in. Bore, Chrysler, Dodge, Plymouth, 383, Set of 8

Part Number: UEM-KB162-020

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Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Flat, 4.080 in. Bore, Chrysler, Set of 8

Part Number: UEM-KB243-040

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Flat, 4.372 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB240-030

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Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Flat, 4.380 in. Bore, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB237-060

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Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

KB Hyper Piston - Chry 408 Rod 6.123 Step Dish 23.5cc 2V No Quench Dome

Part Number: UEM-KB416-030

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Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Flat, 4.060 in. Bore, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB107-060

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Flat, 3.950 in. Bore, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB167-040

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Step, 4.350 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB184-030

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Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Step, 4.360 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB184-040

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Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Flat, 4.360 in. Bore,, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB237-040

Not Yet Reviewed

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Pistons, Hypereutectic, Flat, 4.310 in. Bore, Chrysler, Dodge, Plymouth, Set of 8

Part Number: UEM-KB162-060

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Pistons, Hypereutectic, Dome, 3.950 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB399-040

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Pistons, Hypereutectic, Flat, 4.342 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Mopar, Set of 8

Part Number: UEM-KB240-STD

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