Can you change the intake manifold on a 1995 4.3 vortex and use engine in 1991 throttle body truck?

It is possible to change the intake manifold on a 1995 4.3L Vortec engine and use it in a 1991 throttle body truck, but there are some modifications that will need to be made.

The 1995 4.3L Vortec engine uses a different intake manifold bolt pattern than the 1991 throttle body truck engine. This means that you will need to use an adapter plate to mount the Vortec intake manifold to the 1991 engine block.

Additionally, the 1995 Vortec engine uses a different fuel injection system than the 1991 throttle body truck engine. This means that you will need to use the fuel injectors and fuel rail from the 1995 engine in order to run the Vortec engine in the 1991 truck.

Finally, the 1995 Vortec engine uses a different throttle body than the 1991 throttle body truck engine. This means that you will need to use the throttle body from the 1995 engine in order to run the Vortec engine in the 1991 truck.

Once these modifications have been made, it will be possible to run the 1995 4.3L Vortec engine in the 1991 throttle body truck.