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1979-1980 GMC K3500 400 CID
Black Anodized For Long Lasting Good Looks
Built in 1bar MAP (Manifold Air Pressure) sensor
7L V8 289 CID (Fits both 2BBL and 4BBL)
Water Methanol Pump - 557-100 universal-joints-and-driveshafts 1979-1980 GMC K3500 400 CIDOverview: Take your forced induction ride to the next level with a Holley water meth injection system! Integrated into the Holley HP and Dominator EFI Systems is the capability to control water methanol injection, allowing you to safely run on lower octane pump gas! What makes the Holley water methanol system unique and light years ahead of competitive systems, is that the solenoid flow has been characterized within the ECU. Program in an exact flow
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