Hey guys this might seem like a stupid question, and probably is, but is redlining your engine in a blazer..the 4.3 good to do every once in a while? I ask this because my brother said it is, but i don't believe him, seems like it would just put a crap-ton of stress on the engine and hurt it. Also it's like impossible to redline the 4.3 it seems...I've kinda tried but afraid I will break something.

Good or bad?

Thanks

 

You should slap your brother upside his head. Redlining ANY vehicle isn't good for it.

 

Hmm well I just googled it and found some forum saying it's good to do every once in a while as it clears carbon buildup...kinda makes sense both ways...

 

Revving to get rid of carbon does... not redlining.

 

Well, any given engine has 'x' number of RPMs in its life cycle, so...

 

OK, I will give you that much. However, there is a reason that line is there. Reason being that the engineers feel it is not good for the motor to rev past that level. Which is why even under wide open throttle, the trans shifts just shy of red line.

I stand by my statement of revving occasionally being OK, but going to red line is no bueno.

 

Im thinking Petty will chime in on this but to answer your ?. I say absolutely not. Unless your motor is built will all forged internals to include the heads you will only damage something. Trust me, I am speaking from experience. My Blazer startling ticking (stuck hydraulic lifter) during the winter a couple of years ago and would usually quiet down when I added an additive. This year it had gotten really bad and one morning really got to me, i put the car in park and Relined it. Although it was only for a second if that my problem went way past the "just add an additive" and problem solved situation. I am stuck now with replacing the motor. Don't do it

 

Drag race engines get redlined every time they run. Then they get re-built every time they run. Have heard of a good hard run on THE ROAD before a smog test to clear a marginal cat.

 

can you do it? sure. is it bad? well yea. but i rev mine to 5k all the time on wot's,for the last 2 years...no issues so far knock on wood.

 

Thought I had replied.. guess I lost interest
Use your heads. Build up to it.. or seafoam the thing first and drive it a hundred miles or so, before going over 4500. Ramming your pistons into the head is not a good thing

If you do it, do it ONLY under load.
Doesnt take any effort to get the engine to redline rpm in neutral So how's it gonna loosen up carbon, except beating against the heads??{DAMN dont do that in park!!! ONLY time I ever redlined an engine was on a 'now we're drunk, let's be stupid' bet.. knew the valves would float at 5000, but I forgot to put it in neutral instead of park. Blew the trans} My recent post on exercising it, never even THOUGHT of doing it except under power. And no reason to go to redline, either.


I addressed the whole thing...
https://blazerforum.com/forum/genera...on-slap-68262/