OEM ECU PROM Chip – AC Delco

🧠 STOCK-TUNE RELIABILITY – FACTORY PROM CHIP FOR YOUR TURBO BUICK ECM

This is an OEM GM AC Delco PROM chip for the 1986–1987 Buick Grand National. It installs into the factory ECU (1227148) and controls engine fueling, timing, and boost management. Perfect for returning a modified car to stock, verifying baseline performance, or keeping a spare on hand.

✅ Fits 1986–1987 Buick Grand National & Turbo Regal (ECM #1227148)
✅ Genuine AC Delco chip – factory GM calibration
✅ Controls spark, fuel, and boost strategy
✅ Drop-in ready – no tuning required
✅ Great for stock rebuilds or emissions testing

🟢 Green Dot – Used but verified functional. Pins are straight and clean. Label intact. Ready to install.