Part Number 12707877 Replaces Part Number(s) 12689504
Looking to convert your LT1 High Pressure Fuel Pump into a LT4 High Pressure Fuel Pump? This is the Harnesses needed to do this conversion! GM changed the connector design on 2019-2024 Models and therefore would require the 2016-2019 Fuel Rail Harness that includes the High Pressure Fuel Pump Plug. This harness is plug and play. A tune is required to run a LT4 High Pressure Fuel Pump on a LT1 Model.
General Motors is an OEM manufacturer. GM designs and creates the vehicles and the parts for them for makes such as Buick, Cadillac, GMC, and Chevrolet. All GM branded parts are OEM standard quality components and were designed and manufactured to either be on the vehicle from the factory or purchased after the fact as an accessory.