I met a guy who asked me to post this question. He ordered this truck when he bought it new, and he has a 92 S-10 with a 4.3L V6 with "Port Fuel Injection". His invoice lists it as a $1500 option. It has the word VORTECH (or however you spell it!) on the intake, which I think predates the release of the VORTECH engines. I haven't seen it yet, but he says it looks different than any other 4.3L V6 in an S10 he has seen. It also has posi-traction. Can anyone tell us about his engine, and how rare it might be?