The Auto Shop
     Vortec CSFI to MPFI conversion

GM 4.3, 5.0 and 5.7 Vortec Injector conversion

Vortec 4.3L 5.0L and 5.7L engines from 1996-2002 have been found to be very sensitive to fuel deposits in the fuel injectors. The Vortec Central Sequential Fuel Injection system utilizes a unique fuel injector for each cylinder. The injector coil is located in the central 'spider' with a tube sending the injected fuel to a poppet nozzle in the port of each cylinder. These poppet nozzles require >45psi fuel pressure to open when working properly. If the poppet becomes contaminated or the fuel pressure is lower than specifications, the injector will not fire.

Below is an example of the original CSFI Vortec Spider.

The Auto Shop's Vortec MPFI conversion eliminates the poppet nozzles, instead placing the injectors at the end of the tubes as shown below. This system fits under your stock upper intake with no visual changes when fully assembled. There are no computer calibration changes required, it is a 100% bolt in conversion.

The photo below show the system installed on a 5.7L engine. The stock upper intake fits over this system just like the original CSFI injection.

Due to many questions about what is included with this kit, here's what you get:

-Complete spyder assembly
incl fuel pressure regulator
spyder body
injectors and tubes

-New mount bracket
-Spyder to plenum seal
-Upper intake plenum seal
-Throttle body seal

FREE SHIPPING to the lower 48 States!!!!

Please select your location from the dropdown menu.
For locations outside the United States and Canada, please email for shipping quote.
Iowa requires all units shipped in the state to be charged 7% sales tax. 

V6 Kit: $485.00

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These prices include all necessary parts and gaskets.
On most V8 models, you will need to provide coolant as the upper radiator
hose will need to be removed  to clear the upper manifold.

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Also, you may send a check or money order to:

The Auto Shop
1095 Cedar Valley Road
Tipton, IA 52772

Please call 563.886.2821 or email below with any questions.


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Revised: 01/21/13