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Thread: head bolt torque 41ft. lb. + 90deg.?

  1. #1

    head bolt torque 41ft. lb. + 90deg.?

    1997 3100 Monte. 41 ft. lb. doesn't seem like very much torque for a head bolt, but adding 90 degree's more to the bolt on the second pass seems like a lot. So whats the final torque? Do you mark the head bolt, call that 0 degrees, and turn 90 more degrees from that point?............Tom

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  3. #2
    The Situation geldartb's Avatar
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    off on your numbers a bit but here are the correct specs.

    Tighten the NEW cylinder head bolts to 60 Nm (44 lb ft) in the order shown. Use the J 36660-A torque angle meter in order to rotate the cylinder head bolts an additional 95 degrees .
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    99 Grand Am GT
    3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
    Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
    1357 cam 227 233 .050 dur
    515 515 lift 112 lsa
    15.232@88.85mph on stock 3400---New time to come



  4. #3
    Here's what this site's home page under engine specifications has for bolt torque sequence and foot pounds applied.
    First Pass 55n 41ft.
    Final Pass Add 90 degrees

    *Manifold Side*
    6 2 3 7
    Notice the circular torque sequence versus your staggered sequence?
    5 1 4 8
    * Outer Side *

  5. #4
    The Situation geldartb's Avatar
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    the torque sequence was revised so depending on when that was written on here it most likely was written before the specs were revised.

    date on this article for the revision say 08 so most likely the stuff on this site was written before that.
    INFORMATION

    Bulletin No.: 02-06-01-003B

    Date: April 15, 2008
    Subject:
    Revised Cylinder Head Bolt Torque Specification and Tightening Sequence

    Models:
    1994-1998 Buick Skylark
    1994-2002 Buick Century, Regal
    2002 Buick Rendezvous
    1994-1996 Chevrolet Beretta, Corsica, Lumina APV
    1994-2000 Chevrolet Camaro, Lumina
    1994-2002 Chevrolet Monte Carlo
    1997-2002 Chevrolet Malibu, Venture
    2000-2002 Chevrolet Impala
    1993-1996 Oldsmobile Ciera
    1993-1997 Oldsmobile Cutlass Supreme
    1994-2002 Oldsmobile Silhouette
    1996-1999 Oldsmobile Cutlass
    1998 Oldsmobile Achieva
    1999-2002 Oldsmobile Alero
    1994-2000 Pontiac Firebird, TransSport
    1994-2002 Pontiac Grand Am, Grand Prix
    1999-2002 Pontiac Montana
    2001-2002 Pontiac Aztek

    with 3.1L or 3.4L Engine (VINs J, E - RPOs LG8, LA)

    Supercede:

    This bulletin is being revised to include a Notice advising that the cylinder head bolts are NOT to be re-used. Please discard Corporate Bulletin Number 02-06-01-003A (Section 06 - Engine).
    Notice: This component uses torque-to-yield bolts. When servicing this component do not re-use the bolts. New torque-to-yield bolts must be installed. Re-using used torque-to-yield bolts will not provide proper bolt torque and clamp load. Failure to install NEW torque-to-yield bolts may lead to engine damage.

    The cylinder head bolt torque and tightening sequence have been revised. This revision has been made in the SI. If you are using a paper version of this Service Manual please make a reference to this bulletin on the affected page.

    The revised specification is as follows:
    this and the specs i posted were pulled from my alldata subscription

    99 Grand Am GT
    3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
    Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
    1357 cam 227 233 .050 dur
    515 515 lift 112 lsa
    15.232@88.85mph on stock 3400---New time to come



  6. #5
    Thanks........Tom
    By the way. I used your new numbers for torquing the heads + 95 deg. I used a dial foot pound torque wrench and after adding the 90 degrees, final torque was at around 97 foot pounds...This number is what i got. Please do not use it for a replacement of actual bolt degreeing.
    Last edited by fastback4; 06-05-2010 at 11:33 AM.

  7. #6
    I realize this is a very old post but I have the same question but I have a 1996 3.1 engine with a (M) code.
    The link geldartb posted only says
    "with 3.1L or 3.4L Engine (VINs J, E - RPOs LG8, LA)" but it does not say (M)

    I keep seeing 33ft lbs +90 degrees for my engine.

    Aren't the heads basically the same outside of intake locator holes and size? So why would the torque be different?

    I am putting redone heads on my 96 Monte(engine actually came out of a 94 Buick) so I have ball and stud rockers.

    Checking Rock Auto the head bolt numbers from Fel-Pro are different BUT if you examine cylinder head replacements while the heads look the same the numbers are different.(I have the 10154743 heads btw)

    Do the new torque specs apply to the (M) also?
    Thank You
    Last edited by Jcdew67; 05-05-2015 at 01:35 AM.

  8. #7
    The Pink Car 3400-95-Modified's Avatar
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    Might just be revised torque that they found would work better. It would probably work out fine since that number sounds familiar to what I've done in the past.

    Got Lope? New vid coming soon... Spring 2015!
    3500 Build in progress, XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
    Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
    Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
    12.67@107.43 Chevy Fest, Epping NH Oct 2010 Nitrous 100shot
    2007 Legacy GT Limited 5-speed 3" Turbo Back, Stage 2 - 255whp/310wtq

  9. #8
    Ordered new Felpro head bolts,I ordered them for a 1996 Monte Carlo ,On that box it said

    ES72892
    3.1L Vin-J 2000
    3.4L Vin-E 1996-00

    Now it seems that set is given for even a 1996 Monte Carlo Vin-M it seems so I am going to go with the revised specs,part of me is scared cause I read on some forums a guy had his break doing revision.I can't see how that happened as these bolts look the same as the ones I took out.

    I know I am just being nitpicky

  10. #9
    The Pink Car 3400-95-Modified's Avatar
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    The bolts are probably all the same. I highly doubt you will break them. Just send her in!

    Got Lope? New vid coming soon... Spring 2015!
    3500 Build in progress, XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
    Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
    Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
    12.67@107.43 Chevy Fest, Epping NH Oct 2010 Nitrous 100shot
    2007 Legacy GT Limited 5-speed 3" Turbo Back, Stage 2 - 255whp/310wtq

  11. #10
    W-Body for Life! robertisaar's Avatar
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    i just did the 44+95* on my 95 3100 a couple weeks ago, didn't kill any bolts. using fel-pro permatorque severe duty headgaskets.
    1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
    Latest nAst1 files here!
    Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

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