






🛠️ Upgrade your LS engine’s lifeline—because clean oil means peak power.
The Improved Racing Billet Rear Passage Plug is a precision CNC-machined 6061-T6 aluminum replacement for GM LS Gen III & IV plastic barbell plugs. Featuring a double Viton O-ring seal and a threaded removal hole, it eliminates dirty oil bypass, improves oil flow, and simplifies maintenance—all proudly made in the USA.








| Manufacturer | speedway motors |
| Brand | Improved Racing |
| Package Dimensions | 12.3 x 9.7 x 1.3 cm; 27 g |
| Item model number | EGM-501 |
| Manufacturer Part Number | EGM-501 |
| OEM Part Number | 12573460 |
| Material | 6061-T6 Aluminum, Viton O-rings |
| Assembly Required | No |
| Manufacturer | speedway motors |
| Item Weight | 27 g |
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