4.3 s-10

I guess 91 was A VERY GOOD year ,my s-10(Durango) has 205,950 miles no knocks
no major work on eng or trans. The 4.3 tbi still outruns 98% of speed deamonds on the morning commute.

glad too hear it got a 91 4.3 as well great ride....s-10 blazer lotsof fun good freeway miles run a higher octane for a noticable differance.

Higher octane in a 4.3L is a waste of good money.

Our engines are tuned for 87 octane.

I love how they run forever and no problems. My only problem was alternator until I rebuilt it to 140 amp.

you can put that lucas gas treatment in i get 18mpg for bout a month in my 4.3 91

Lucas oil treatment does not increase fuel economy.

What it might do is raise compression slightly seeing it thickens the oil and might seal the pistons rings a little better.

He said gas treatment.

Woops.....my bad.