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Engines and Components› Pistons and Piston Rings
KB PERFORMANCE PISTONS
SBC Flat Top Piston Set 4.040 Bore -6cc
SKU: K02K KB231.040
Advanced — 4+ hours
Overview
Each piston includes a CNC-machined crown, a high upper compression ring location, a gas-accumulator groove, drilled oil returns, and spiral-lock retainer grooves. The lightweight, rigid-rib skirt design helps stabilize the piston in the bore, providing improved oil control, reduced blow-by, and increased ring life. The pistons utilize a 1.561-inch compression height and have a +6.00cc piston head volume.
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Part #: KB231.040
Piston - KB Series - Hypereutectic - 4.040 in Bore - 1/16 x 1/16 x 3/16 in Ring Grooves - Minus 6.00 cc - Small Block Chevy - Set of 8
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | KB PERFORMANCE PISTONS |
| Part Number | K02K KB231.040 |
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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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