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American Cars
Chevy Silverado
Chevy S-10

What are the differences between a 1985 4.3L V6 and the newer 4.3L Vortec because i want to supercharge my 85 C10 4.3 but all i can find is S10 4.3 vortec superchargers?


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December 07, 2008 8:04PM

In 1992 GM added a balance shaft to the block to control vibration. Other than that the engine was the same since 1985(aside from intake changes on the CPI models) In late 1995 GM changed the head design allowing it to flow better, making more power. Along with its head change, the way the intake bolts onto the heads changed, making it unique to these newer engines. These are what everyone refers to as the 4.3L Vortec. Even though 1987 and on Truck engines carried the Vortec referance name. The Block however really never changed from 1992. Unless you want to do a complete transformation, to newer engine, wiring, fuel pump, PCM/ECU...... ...then the S10 4.3L Vortec Supercharger is no good to you. However if you search a little more, there is companies that make superchargers for the TBI models. : And for you carburetor guys. :