Helix Power Tower

Installation Instructions

(1996-2001 GM C/K 2500/3500 7.4/8.1L V-8 VORTEC Part #74015)

Important! Read all instructions before you begin installation.

1.      Remove the “VORTEC” diffuser. Loosen the clamp at the throttle body. Disconnect the air temperature sensor and the mass air flow sensor. Loosen hose from air cleaner and remove the intake hose assembly. Now remove the complete air cleaner assembly.

2.      Disconnect the throttle cable and cruise control cable bracket from the intake manifold.

3.      Assemble the extension bracket to the cable bracket, as per illustration. Attach the bracket extender to the intake manifold with the longer bolts and spacers.

4.      Adjustment of the cruise control cable is needed to make sure of a proper idle. Adjust the cable end so that there is at least 1/8” deflection up and down.

5.      (Note: 8.1L engines, unclamp and remove the air inlet tube from throttle body. Now continue with step 5.) Remove three retaining nuts and studs from the throttle body. Lean throttle body back and remove throttle body gasket from the intake manifold.

6.      Install the Helix Power Tower, sandwiched by two gaskets (supplied in kit) onto the manifold with the longer bolts and washers (supplied in kit). Torque bolts to 12 ft/lb.

7.      Reinstall the air cleaner assembly, the supply hose and MAF sensor, and secure the “VORTEC” lid with nut and clamp. Reconnect the sensor connectors. Make sure that all the connections are properly connected and tightened. (Note: 8.1L engines reinstall the air inlet tube onto the throttle body and tighten the coupler clamp securely)

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

ASK ABOUT OUR COMPUTER REPROGRAMMING AND

CHIP REPLACEMENT FOR EVEN MORE HORSPOWER!