What is the redline of a 1991 4.3 Throttle Body Injection engine?

Question

It is in a 1991 GMC Sierra

Answer 1

I own a shop, and think this engine should rev up to 5-55 without breaking. It is making its most power from 4,500 up to 5,500. You should be able to see the 5,500 before shifting, but I wouldn't recommend doing it all the time. 5,000 is about the beginning of the red-line, so the point where it begins to fall off, as in a higher gear would make more torque is the point of shifting. No need to take it higher if the next gear would make more torque. The thing to do is; run it moving your shift point up about 500 rpm each time, and see what delivers the best time. This way you will know what the limits of the engine are. As for the 4.3, someone said its not a race engine, well I beg to differ. There is all kinds of stuff like a four barrel intake on the market for them now. They can be made into a screaming little machine. They use a distributor too, so if that's not an incentive to build it, then what is?
Glad to help out, Good Luck!!!

Answer 2

It's a good engine, not a race engine

Answer 3

I really not know, but, assume somewhere around 5,000 RPM.