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Be my Horse power and torque estimater

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Sparky, Apr 1, 2001.

  1. Sparky

    Sparky 1/2 ton status

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    Tell me what you think my 78 with a 350 has in HP and torque. It is a stock engine other than a comp cam .442 intake, .460 exaust 260 degree duration. It has a Q-jet, no emmisions stuff. (no EGR or Cats), open element K&N. The heads have about 10,000 miles on them after a valve job. The cylinders and pistons have about 20k. and the carb was just rebuilt so evrything is in near perfect shape.

    I was guessing around 200hp and about 300lb-ft of torque. Am i being to optomistic?

    Do you think I can achieve 350hp and 350lb-ft if I add vortec heads, headers, dual chamber flowmasters, and edelbrock performer intake for the vortec heads?

    Let me know if there is anything else I could do to achieve the 350 350 numbers and still be able to run off the cheap stuff at the pumps. I dont want any high compression stuff and a stroker costs too much right now. Let me know what ya think. No big blocks either. I gotta be able to afford to drive it. HEHEHE. Thanks

    Sparky

    When all else fails... Check the blinker fluid.
    78 K-5
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I would guestimate, uhhh, 600 horsepower and 900 ft. lbs. of torque!!! [​IMG] Just kidding! LOL! Thought the numbers sounded cool, though! [​IMG]
     
  3. '73 K5

    '73 K5 1/2 ton status

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    Your numbers look OK now, but I don't think adding all that stuff will give you another 150 horses. The Vortec heads really are the way to go though. I noticed a HUGE power increase after I swapped mine on. It just ran like a different engine above 2500 RPM.

    '73 K5
    Chevy good...Ford bad
     
  4. Blazer79

    Blazer79 1/2 ton status

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    My Chilton's manual states that 1978 350 Blazer engines had 165hp and 270 ft/lb of torque. However, there's a note that states that these figures are net, measured with all engine accessories installed and operating at the rear of the transmission. So you could say that your engine has about 200 brute hp or maybe even a little more because of the cam.

    If you want to find out which components make different hp figures, goto <A target="_blank" HREF=http://www.chevymania.com/dyno/index.htm>http://www.chevymania.com/dyno/index.htm</A> and see the dyno results for yourself.

    Hope this helps.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  5. HarryH3

    HarryH3 1 ton status Author

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    350 HP will take a rather agressive cam. Heads and exhaust alone won't make that huge of a difference. Call and talk with some of the cam companies tech lines. They can help you determine the best cam for your application. They can also help prevent you from installing so much cam that your truck can't 4-wheel worth a darn, unless you're into full-throttle mud racing. [​IMG]

    Comp cams should even be able tell you how much power to expect with your current cam and the Vortec heads.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  6. Sparky

    Sparky 1/2 ton status

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    Ok so I'm shooting a little hi for the 350 horses. How about 300hp and 350lb-ft of torque? Although i like to play in a little mud I dont put bets down on mud draging so I dont want to switch to a more agressive cam. I like my perfectly smooth idle that I have now and I like to play on some rocks sometimes so the more agressive cam gos out the window. Oh well, I'll still be able to give all of those foregin sports cars a good run for their money off the line. [​IMG]

    When all else fails... Check the blinker fluid.
    78 K-5
    <P ID="edit"><FONT SIZE=-1>Edited by Sparky on 04/02/01 09:42 AM (server time).</FONT></P>
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

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    I think your numbers are close..

    As far as getting 350hp.. You will probably need some more add on to reach 350.. the Vortec heads are said to add 50hp...

    Stroke job may be a ticket to get to 350 or check out the specs on a 350HP crate engine and follow those...

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>

    "He who uses a winch...... Is tired of yankin!"
     

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