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projected redline on 350?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 77K5Blazer, May 25, 2001.

  1. 77K5Blazer

    77K5Blazer 1/2 ton status

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    All right, what is can I safely consider the redline on my '89 carbed GM 350 crate to be? My dad says that it is 3,000 rpms, but that sounds a little low, what can I run it to, without any worries? Thanks a lot!

    1977 Blazer, GM350, SM465, NP205, Dana 44/ 12bolt, 31x10.50r15 BFGs
     
  2. 90K5

    90K5 1/2 ton status

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    I think its 4500 to 5500, something like that....not much power up there anyway.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  3. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    Your Dad's telling you 3000. So you don't redline it and he as to buy you a new motor......LOL
     
  4. 77K5Blazer

    77K5Blazer 1/2 ton status

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    Yeah right, I wouldn't want my dad to buy me a new motor! I am proud to say that I worked my A$$ off for 3 years to earn the money to buy my K5, and I love it! I don't want to blow up my motor, cause if I had to put a new one in, I would want a 454 WAY to badly, and I can't afford that!

    1977 Blazer, GM350, SM465, NP205, Dana 44/ 12bolt, 31x10.50r15 BFGs
     
  5. Cavalry

    Cavalry 1/2 ton status

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    I dont know what crate engine you are running but my 350HO is listed as a 5500 RPM redline...The ZZ4 is like 5700

    "There is a fine line between hobby and mental illness"
    Luke
    84 K5
     
  6. Sparky87k5

    Sparky87k5 1/2 ton status

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    Max RPM's is relative to how much money you have to spend. If you have a lot, take it to 55-5700 frequently, if you want to keep your money for better investments then new engines, consider 5000 max and even 45-4800 for best use of the torque curve that most crate engines like the 300 or 330hp versions. I run a pro-built engine that saw 5800 on the dyno during break in but has never seen over 4800 running in the truck. They just plain cost too much.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 stroker. Build it Bulletproof and take it fishing!
     
  7. 77K5Blazer

    77K5Blazer 1/2 ton status

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    Next question...it is completely stock and I don't know what model it is, I know that it is an 89 GM 350 crate motor, so how do I find out what the estimated horsepower is?

    1977 Blazer, GM350, SM465, NP205, Dana 44/ 12bolt, 31x10.50r15 BFGs
    Steve Fox for US president!!
     
  8. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    My 350Ho is 5500 - 5800 safe max.
    If it is a crate motor, there is a tag on the pasenger side of the block in the middle, just above the motor mount. Check the numbers with your local GM dealer or try this
    <A target="_blank" HREF=http://www.gmgoodwrench.com/crate_engine/index.htm>http://www.gmgoodwrench.com/crate_engine/index.htm</A> I built a 327 along time ago that could handle 10,000. To bad I couldn't find a dist. that could. Good luck.

    [​IMG]<font color=red>[/b]"Rid'in HigH in my K5"[​IMG]
    ....[​IMG]<font color=blue>[/b]"6" Lift -<font color=purple>38.5's"[​IMG]....
     
  9. Twiz

    Twiz 1/2 ton status

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    Redline? Just before the internal combustion engine becomes a external combustion engine, then back off the throttle.

    And duck for projectiles.

    Twiztid
     
  10. 77K5Blazer

    77K5Blazer 1/2 ton status

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    Hahahaha....that is what I want to avoid if at all possible!! Don't want any projectiles other than mud flying from my tires!!

    1977 Blazer, GM350, SM465, NP205, Dana 44/ 12bolt, 31x10.50r15 BFGs
    Steve Fox for US president!!
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Reminds me of when I asked the same question at an engine building shop. The guy looked at me with a straight face and said the only 100% safe RPM for any motor was 0. [​IMG]

    I actually would like to install a rev limiter on mine...the last time I was in the mud I glanced at the tach as it was coming down from 6000 RPM [​IMG]. Its too easy to get carried away!

    Normally my little 350 never goes over about 4000 RPM, even that is rare.

    Rene

    <font color=red>If at first you don't succeed...skydiving ain't for you!</font color=red>
     
  12. Twiz

    Twiz 1/2 ton status

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    Ohh boy, could I show you some reel distruction!
    Chunks of unidentifiable parts, rods hanging ot the side of a block, hydo locked blown and injected engine (bent the aluminum rod up like V and twisted it), BIG holes in the side of a block you could fit your fist in! A rod hanging out the bottom of a LS7 454 chevel's oil pan.

    I've been saveing some of the parts, and I'm going to hang them on "the wall of devistation" in the garage.

    Twiztid
     

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