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TBi 350 redline?

Discussion in 'The Garage' started by TXsizeK5, Sep 23, 2002.

  1. TXsizeK5

    TXsizeK5 1/2 ton status

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    If i have a brand new longblock 350 what is the redline for it? Thanks
     
  2. heavy4x4

    heavy4x4 1/2 ton status

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    This has been a topic of discussion many times. Try a search.
    I'd say actual, top-end, shouldn't-push-it-any-farther redline on a new 350 would be 5500rpm.
    However, come around 4000-4500 rpm, unless it was built for a high rpm powerband, you won't be gaining hp anymore. IF I had a tach in my truck with a redline pointer, I'd set it at 4500. Safe bet to keep a 350 from throwing a rod, and hp has already peaked by then.
     
  3. 87sm465np208

    87sm465np208 1/2 ton status

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    yea its weired i read a while ago that the 91's 350 tbi blazer red lined at 6000 rpm, i never take mine above 3000rpm, i took it really high once and the oil light flashed for an instant and freaked me out, so i dont take it up really anymore, i shift at around 2000rpm, unless im raceing my friend in his blazer, then i slap shift and try not to clash it into granny.
     
  4. BowtieBlazer

    BowtieBlazer 1/2 ton status

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    I am much like you 4000 is the max my engine sees and its even built for top end. I usually shift around 3000 and get teh best mileage in that range.
     
  5. mitymouse

    mitymouse Registered Member

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    Did the block come with a cam card?
    you should be able to feel when you reach the end of the power band,the truck will start to fall on its face back your tach off a little before that point to compensate for your shift reaction time you should stay safe, however if this block is "fresh" I really wouldnt be testing its redline capabilitys just let.
     
  6. TXsizeK5

    TXsizeK5 1/2 ton status

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    Yeah, i have about 400-500 miles on it now. I never take it over 3grand but just today i took it to about 3.5k -4k and noticed it pulled really well in 1st at that range and the exhuast sounded quite nice =) So was just wondering if id hurt anyhting revin 4 grand on the occasion of racin' or muddin' Thanks!
     
  7. ben427

    ben427 1/2 ton status

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    i rev mine (1995 GMC) to 4500-5000 on a daily basis, but im really hard on gear and really hate the truck cause its a lemon. So i wouldnt recommend it. I havent had any trouble yet (100K miles) and the oil stays clean and gets changed every 3000 miles. I also use a good oil. 15W40 in the summer and 10W30 in the winter. ALL synthetic.
     
  8. heavy4x4

    heavy4x4 1/2 ton status

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    What makes you think your truck is a lemon if you can take it to 5000 rpm regularily and you "haven't had any trouble yet?"
    I back off around 3500 rpm (I think - based on gear/rpm calculators) because the engine sounds really wound up.
     
  9. HarryH3

    HarryH3 1 ton status Author

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    A stock 350 will float the valves and stop increasing RPM's long before it reaches the point of self-destruction. 3,000 RPM is barely getting into the "fun" part of the RPM band! My wife's '94 Sub upshifts at around 4,700 RPM if you're holding the loud pedal against the carpet. /forums/images/icons/cool.gif The factory tach on it has the yellow zone starting at around 4,750 and gets into the red at 5,000. /forums/images/icons/frown.gif My '77 K5 had a factory tach and it didn't show redline until 5,500 RPM. /forums/images/icons/cool.gif I had it to 6K a few times and it was still going strong when I sold it around 150K miles. /forums/images/icons/shocked.gif
     
  10. ben427

    ben427 1/2 ton status

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    Ive had to rebuild front pod, the rear end, and the transfer case. Transmission is on the way out, as is the rear end again, so ive found a 14bSF for a couple hundred with the 3.73 posi, so ill put that in instead of a 10 bolt. I also had quite a few electrical problems. the whole truck is pretty much stock, including tires. The engine is the only good part of the whole truck.
     

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