Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
The 4.3 Z is only throttle body injection. It requires somewhere around 13psi (I did not check, just an estimate) where the 4.3W model uses 55psi+. There is a big difference there for sure. Here is the actual testing for both model. The 4.3Z is first and then the 4.3W.