Engines and Components› Pistons and Piston Rings
United Engine & Machine Co
SINGLE KB PISTON OLDS 403
SKU: U00B SKB405.039
Advanced — 4+ hours
Description
This piston has a bore size of 4.390 inches and a crankshaft stroke of 3.385 inches. The compression height is 1.615 inches, with a piston head volume of +6.00cc. It utilizes a press-fit wrist pin style.
Fitment
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Specifications
| Brand | United Engine & Machine Co |
| Part Number | U00B SKB405.039 |
Buy with Confidence
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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