Head Bolts too tight?

Small Block Mopar Engine

  1. seabee

    seabee FABO Gold Member FABO Gold Member

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    If I ask anymore questions today I might have to start paying out royalties........:prayer:

    This "Small Block Mopar" book I have been using said 105lbs for the head bolts. I tightened everything down in the right sequence going 10lbs at a time until I reached 105lbs.

    While looking through my shop CD today I saw 95lbs as the recommended torque. I know it's only 10lbs but before I finish assembly I want to eliminate any doubt.

    leave it? Replace it? New bolts? Quit crying?
     
  2. 67Dart273

    67Dart273 FABO Gold Member FABO Gold Member

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    My MP "Small Block, A Engines" books says

    "reprinted from 68......."

    273, 318, 340, 85 ft lbs

    "reprinted from 74......"

    318, 360 95 ft lbs


    and the online 72 shop manual says 95
     
  3. RedFish

    RedFish FABO Gold Member FABO Gold Member

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    Since you've already went to 105 dont back up and re torque. With the poor quality of torque wrenches sold today, No worries.
     
  4. Bulldozer

    Bulldozer free ice cream sandwiches

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    for sure. plus you will lose a little through the socket and extension if you used one
     
  5. Bad Sport

    Bad Sport HALF A BUBBLE OFF Staff Member FABO Gold Member

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    I'd run it, if it were mine.
     
  6. seabee

    seabee FABO Gold Member FABO Gold Member

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    [​IMG]
     
  7. Bulldozer

    Bulldozer free ice cream sandwiches

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    now Quit your cryin' LOL
     
  8. daredevil

    daredevil Well-Known Member

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    depends on what lube you use as to whats correct
     
  9. OldmanRick

    OldmanRick Well-Known Member

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    I've always cheated a hair on head bolt torque, let it eat....
     
  10. Badart

    Badart Senior Member

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    Yep my book says 85 lb for 273's. Just torqued mine down today. I hope that you chased the treads? I would run it if I were you.
     
  11. p/schallenger

    p/schallenger Well-Known Member

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    how to hotrod a s b m states 105 and i always do. head bolt on the s b m suck. i put studs in everything s b m now. they can't take very much over 10.75
     
  12. SirDan

    SirDan Well-Known Member

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    My 79 engine book said 105.

    I just built an engine and torqued to 105, I won't be losing any sleep over it.

    It would be interesting to know why the specs changed. I would imagine gasket technology has changed a lot since 1968. even from 1968-1979 that's a lot of time. Think about what has changed since 1991-2012? I guess that's comparing apples to oranges but you get the point. Some of you old farts might even remember 68-79.:D
     
  13. IQ52

    IQ52 Well-Known Member

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    It'll be okay if you replace the gas tank and rotate the tires. As far as tire rotation, just jack the car up and spin the tires by hand and set the car back down, you needn't change their location on the car.

    Ahem, If the block was honed with a deck plate, and you didn't torque the bolts to the setting used during the honing process and you didn't use the same part head gasket used during the honing, you will have effected the ring sealing somewhat.

    I admire your tenacity, ten pound increments to 105 ft-lbs? You one tough hombre!

    Oh! Seabee! That's why.
     
  14. 65Valiant310

    65Valiant310 Well-Known Member

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    Not to hijack, but how many lbs does it say for a 79 318 exhaust manifold bolt?
     
  15. moper

    moper Well-Known Member

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    x2
    And thanks for you service! Have a great Memorial Day.
     
  16. Isaac

    Isaac Active Member

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    It's handy to have a torque wrench calibrator.Most viable machine shops will have this tool and wont even charge a fee (if you don't own one and are friendly with your machinests)
     
  17. seabee

    seabee FABO Gold Member FABO Gold Member

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    If I wear gloves while rotating the tires will it still be "by hand"?
     
  18. Mopar to ya

    Mopar to ya Well-Known Member

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    Wrong! Tires rotate while you drive. No need to jack it up. Spot on on the gas tank. I never thought of that.

    My Mopar bible says 85 ft-lbs (273-318) 95 ft-lbs (340-360)

    That said, run it as it is. You can't loosen and retorque because the gasket is compressed. If you do, you need to change the gasket as well. You will be fine. Don't lose any sleep over this.

    View attachment bible.jpg
     
  19. 1wild&crazyguy

    1wild&crazyguy Banned

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    lol
     
  20. 1wild&crazyguy

    1wild&crazyguy Banned

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    Next time just go 50lbs and then like 15 lbs after that, no need for such small increments.
     
  21. bad440

    bad440 everything,all the time..

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    was thinking that damn would have took a lot of time....
     
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