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KB Performance Hyper Piston and Ring Kits

4.61 out of 5 stars 77 Customer Reviews

KB Performance Hyper piston and ring kits are offered for a wide range of applications from street and towing to marine and race. The kits feature pistons cast from
KB Performance Hyper piston and ring kits are offered for a wide range of applications from street and towing to marine and race. The kits feature pistons cast from 390 hypereutectic alloy heat-treated to T-6 standards to make them stronger. The pistons also feature fully machined crowns and valve pockets. KB hypereutectic pistons come in several head designs, as well as standard and oversized bore sizes. All KB Hyper pistons are lightweight to improve throttle response and rpm changes, while still being strong enough to withstand high compression and high temperatures. KB Performance Hyper kits (KT) are completed wi
KB Performance Hyper piston and ring kits are offered for a wide range of applications from street and towing to marine and race. The kits feature pistons cast from 390 hypereutectic alloy heat-treated to T-6 standards to make them stronger. The pistons also feature fully machined crowns and valve pockets. KB hypereutectic pistons come in several head designs, as well as standard and oversized bore sizes. All KB Hyper pistons are lightweight to improve throttle response and rpm changes, while still being strong enough to withstand high compression and high temperatures. KB Performance Hyper kits (KT) are completed with piston ring sets containing top rings of moly-coated cast iron (M) or ductile iron (D).

Results 1 - 25 of 227

Piston and Ring Kit, Hypereutectic, Flat, 4.390 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB137KTM-030

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Flat, 4.030 in. Bore, Ford, Kit

Part Number: UEM-KB151KTM-030

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Flat, 4.030 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB115KTM-030

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Step Dish, 4.080 in. Bore, Ford, Big Block FE, Kit

Part Number: UEM-KB150KTM-030

Not Yet Reviewed

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Flat, 4.000 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB115KTM-STD

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Flat, 4.420 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB137KTM-060

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Flat, 4.000 in. Bore, Ford, Kit

Part Number: UEM-KB151KTM-STD

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Flat, 4.400 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB137KTM-040

Not Yet Reviewed

Estimated Ship Date: Mar 17, 2026 if ordered today

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Estimated Ship Date: Mar 17, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dish, 4.030 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB364KTM-030

Not Yet Reviewed

Estimated Ship Date: Mar 17, 2026 if ordered today

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Estimated Ship Date: Mar 17, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Flat, 4.040 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB281KTM-040

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dish, 4.390 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB206KTM-030

Not Yet Reviewed

Estimated Ship Date: Mar 17, 2026 if ordered today

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Estimated Ship Date: Mar 17, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Step Dish, 4.170 in. Bore, Ford, Big Block FE, Kit

Part Number: UEM-KB378KTM-040

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Flat, 4.040 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB246KTM-040

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 17, 2026 if ordered today

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Estimated Ship Date: Mar 17, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Flat, 4.060 in. Bore, Ford, Kit

Part Number: UEM-KB151KTM-060

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Flat, 4.030 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB110KTD-030

Not Yet Reviewed

Estimated Ship Date: Mar 17, 2026 if ordered today

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Estimated Ship Date: Mar 17, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dome, 4.000 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB314KTM-STD

Not Yet Reviewed

Estimated Ship Date: Mar 17, 2026 if ordered today

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Estimated Ship Date: Mar 17, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dome, 4.030 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB116KTM-030

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Dish, 4.400 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB138KTM-040

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dome, 4.020 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB255KTD-020

Not Yet Reviewed

Estimated Ship Date: Mar 17, 2026 if ordered today

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Estimated Ship Date: Mar 17, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dish, 4.390 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB138KTM-030

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dome, 4.040 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB116KTM-040

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dish, 4.420 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB206KTM-060

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dish, 4.420 in. Bore, Ford, Big Block, Kit

Part Number: UEM-KB138KTM-060

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Piston and Ring Kit, Hypereutectic, Dish, 4.020 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB364KTM-020

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/9/2026

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Estimated Ship Date: Monday 2/9/2026

Piston and Ring Kit, Hypereutectic, Step Dish, 4.030 in. Bore, Ford, Small Block, Kit

Part Number: UEM-KB366KTM-030

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today