We have put together this information with the help of Robin Sipe to inform people with 1995-present General Motors 4.3L V6, and the 1996-2000 5.7L V8 Vortec engines.that it is possible to to convert to propane with our components. His company info:

Applied Combustion Technologies, Inc.

5943  242Rd.  RR-1  S-5  C-16

Fort St. John, British Columbia

Canada  V1J 4M6

(250) 263-3558

Robin has spare 4.3L and 5.7L Vortec intake manifold bases, which can be sold on a rotating basis to you. The manifold you receive from him will have the holes pre-drilled and tapped for you. This way you have the correct holes in the right location. At this time we do not know what he will charges, that  is something you will have to discuss with him. Below are pictures from his install and he is currently having no problems with his conversion installation.

Getting started.

Top part of intake removed.

Intake manifold base removed.

Ready to drill holes for the injector nozzles.

Spotfacing injection points.

Installing injector nozzles.

Injector nozzles installed.

Underside of intake manifold base with injectors installed.

With the new gaskets on its time to put everything back together.

Intake manifold base installed.

Injector nozzles temporarily plugged so no dirt enters the engine.

Injector rails mounted securely.

Injecor rails plumed.

Reducer mounted securely and coolant lines plumed.

Propane ECU mounted securely.

The Propane ECU stays dry and out of the weather.

Laptop connection for ECU.

Installation complete. All thats left is the calibration of the ECU.