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
injectors and tubes
-New mount bracket
-Spyder to plenum seal
-Upper intake plenum seal
-Throttle body seal
FREE SHIPPING to
the lower 48 States!!!!
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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.
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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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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