Engines and Components› Pistons and Piston Rings
JE Pistons
BBC NITROUS DOME GP
SKU: J001 312687S
Advanced — 4+ hours
Description
The ring grooves are machined to accept JE Pro Seal series J860 "HNS" Hardened Nitrous Series rings, with specific dimensions for the top ring, second ring, and oil ring. The compression height is calculated using a 9.780" deck height with zero deck clearance, and they fit most open chamber cylinder heads.
Fitment
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Specifications
| Brand | JE Pistons |
| Part Number | J001 312687S |
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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