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The 406 I built dyno results!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Neil, Aug 12, 2001.

  1. Neil

    Neil 1/2 ton status

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    I built a nice 406 for myself, sold my 67 Camaro, so was stuck with a motor. My wife and I got a baby coming in 4 weeks or so. I sold the 406..The man had it dyno'd and checked out cause he doesn't know me. 461 HP at 6100 RPM.
    380 ft lbs of torque at 5700 rpm. the parts to do it you ask?..here's the guts.>..400ci 2 bolt 1975 block, cast stock crank .010 turned down, 5.7 forged rods, flat top w/ 4 valve relief hyperutectic Speed-Pro pistons, 041 casting heads w/ 2.05,1.60 valves, AC Delco R44TS plugs,MSD 6A iggy,Taylor 8mm wires, GM stock HEI w/ MSD coil, Comp cams .280d/.425lift, Manley pro-flow vales, Edelbrock aluminum inatke, Holley 750 vs 4barrell carb w/ interchangeable secondary springs,Cloyes double roller chain, Summit 1.6 aluminum roller rockers, Weiand aluminum water pump, Holley elec. fuel pump and regulator. It was fun but expensive to build. I spent $1300 and did some horse trading on all of the parts except the MSD 6A I already had from my LT1 Z28.

    Neil H.. Alabama.. '78 K5 400ci 4x4 AT,AC,PW Cheyenne. '74 C10 3spd/floor 250ci 4x2
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Your torque numbers seem low for the way that thing is built...did you get a copy of the dyno sheet?

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  3. Twiz

    Twiz 1/2 ton status

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    Sold a '67 !?!?!??
    Are you insane?[​IMG] J/K -kinda-

    <font color=white>It's good to be out</font color=white>
    <font color=white>Out of my mind and out of control</font color=white>
    <font color=blue>Twiztid</font color=blue>
     
  4. pcorssmit

    pcorssmit 1/2 ton status

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    461 hp at 6100 rpm = 397 ft lbs.

    380???

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  5. AZK5

    AZK5 1/2 ton status

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    461 hp from stock heads and that cam???
    CB

    1973 K5, 400TPI,TH350, 203/205, Dana60/Detroit/5.38 front and rear, 4" lift, 38" TSL's on steel wheels
     
  6. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    That cam seems awful small to produce that much horsepower at that high of an rpm! I'm not calling anyone a liar, but that is one of those that I would have to see to believe. I could see 400 lbs. ft. of torque at 3500 rpm maybe.

    '85 K5 : Run it til it breaks, then fix it and go again!<P ID="edit"><FONT class="small">Edited by Mr.Chevy4x4 on 08/13/01 08:32 AM.</FONT></P>
     
  7. Andreas

    Andreas 1/2 ton status

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    Well, with 2.05" &amp; 1.6" Manley Pro Flo valves the heads weren´t very stock anymore, right? I´m guessing a portjob came with them? Flattop pistons usually means a compression around 10:1. A bit small cam, yes. But the guy ran 1.6 ratio rockers to bring up the lift some. If the lift number (.425) is with 1.5 rockers, the lift with 1.6 rockers is .453

    1.14 hp per cubic inch isn´t THAT hard, although it sounds a bit on the high side with the 280 cam. It should produce well over 430 hp anyway, that´s for sure[​IMG].

    Andreas

    406cui of pure sh*t[​IMG]
     
  8. '73 K5

    '73 K5 1/2 ton status

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    I have to agree with Rene on this one. 406's are usually torque monsters so those numbers seem kinda funny.

    '73 K5
    Chevy good...Ford bad
     
  9. CaptCrunch

    CaptCrunch 1/2 ton status

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    I have to agree w/ the torque numbers... wtf? That cam isn't tiny but should be great for a street machine w/ gears, converter, etc. What compression were you running in it? What deck height? Motor will top out at about 6 grand so that seems to be fitting and I can believe 461hp... another thought is what kind of dyno? I assume this is at the fly wheel and not at the rear wheels. Too bad I'm not more of a 400 block guy... heard/seen some awsome 406 combos. But the 383 I just finished about 6 months ago is doing just fine and pulled some pretty sweet dyno numbers.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</a>
     
  10. Andreas

    Andreas 1/2 ton status

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    The 406´s can be built to hp revvers, just stuff some decent (5.7"-6") connectingrods in there. It´s more oversquare than a 383, and for some reason the 383 seems to be THE engine for most ppl. A 383 has the same stroke (3.75") but a smaller bore (4.030" vs. 4.155") compared to the 406.

    /Andreas

    406cui of pure sh*t[​IMG]
     
  11. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Funny my 305 is 330 ft. lbs and all this guy could get from a 406 is 380. WTF was wrong with it? Did you pull spark plug wires off?

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  12. pcorssmit

    pcorssmit 1/2 ton status

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    My 359 is 800 ft lbs, WTF is wrong w/yours?

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  13. Neil

    Neil 1/2 ton status

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    The cam isn't so tiny with 1.6 roller rockers anymore. All I know is what he told me in an e-mail about it. I need to talk with him and confirm this I guess since the torque numbers sound low. I'm not sure if this is in his car or at flywheel. I'll get to the bottom of this.

    Neil H.. Alabama.. '78 K5 400ci 4x4 AT,AC,PW Cheyenne. '74 C10 3spd/floor 250ci 4x2
     
  14. Neil

    Neil 1/2 ton status

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    the ft lbs.torque is 480..he goofed me up. It was my first 406. I'm used to doing 350s and 327s.

    Neil H.. Alabama.. '78 K5 400ci 4x4 AT,AC,PW Cheyenne. '74 C10 3spd/floor 250ci 4x2
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Now that's more like it!

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  16. mike reeh

    mike reeh 1/2 ton status

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    those are some really impressive numbers from such a mild setup. many people put a LOT more money and parts into their small blocks and dont even come close to that kind of power. God I love the sb400.. IMO its the only way to fly.

    mike
     

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