How much camshaft lobe profile change can I run in my engine and still retain the factory fuel injection set-up?
The fuel injection “Set-Up” consists of several different components including an ECM (Engine Control Module), software calibration and matching engine components (i.e. fuel injectors, cylinder heads, camshaft, ect). The ECM calibration and Fuel Injectors are designed to work well with the supplied cam shaft. Changing any components that affect fuel consumption and emissions, may require a different calibration and/or fuel injectors. GM does not provide or support the use of any ECM calibration other than the one provided with the ECM.