Helix Power Tower

Installation Instructions

(1987-1990 GM C/K 2500/3500 7.4L V-8 TBI Part #74005)

Important! Read all instructions before you begin installation.

1.      Remove air cleaner assembly. Note: some models remove the two air cleaner studs.

2.      We need to access the fuel lines attached to the back of the engine/transmission. From underneath the vehicle remove the 13mm nut retaining the wiring harness bracket. Next remove the 15mm stud that holds the fuel line-retaining strap. Reinstall the 15mm stud and replace the wiring bracket fastening it back down with the 13mm nut.

3.      Now that we have the fuel lines unrestricted, unbolt the throttle body bolts. Next remove the old throttle body gasket. It maybe necessary to completely remove the throttle body to do this procedure. After the gasket is removed, raise the throttle body and place a gasket, Helix Power Tower, another gasket and place the throttle body on top of the intake manifold. Once these are placed guide two bolts (drilled on the top) into the outer locations of the throttle body. Lastly, install the last non-drilled bolt in the front. Lightly snug all three bolts in a rotating pattern. Last of all and the most important, these bolts must be torqued to no more than 12 lb/ft. Over torque could result in severe engine damage, which Street & Performance Electronics, Inc. will not be responsible.

4.      Reinstall air cleaner studs, spacer and air cleaner assembly.

Note: you may notice an occasional high-pitched whistle while driving. This is normal.

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