Beginner — under 30 min
Description
Engineered using permanent-mold technology for precise fit and tight bore clearances, these pistons are suitable for high-performance street, bracket, and oval track racing. They have a 4.030 in. bore, 3.480 in. stroke, and a 5.700 in. rod length, suitable for a 5.8L/355 engine displacement with stock stroke type. The piston material is hypereutectic aluminum with a compression height of 1.560 in. and a piston head volume of +6.90cc. They include press-fit wrist pins, and the ring thickness is 1.50mm x 1.50mm x 3.00mm. The pistons feature a DurOshield® coated skirt.
Fitment
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Specifications
| Brand | SEALED POWER |
| Part Number | S03T H669DCP 30 |
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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