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  1. #1

    Default Recommended bolts to attach engine to stand

    Hi folks,

    Hope this isn't too odd or easy a question

    I'm planning on pulling the engine and trans from my 1995 Suburban this coming weekend. The trans is bad due to a case cracked in half, so I figured I might as well just pull the whole thing and take the opportunity to go over the 170k 350, change some seals, etc.

    I have an engine stand, and would like to attach the motor to it once seperated form the trans.

    Question is - what bolts should I use? I don't think the bellhousing bolts would fit through the attachment "arms" which appear to be a good 2-3" tubes. Also I've heard it's recommended to use other bolts anyway, incase anything bends you don't ruin a bellhousing bolt.

    So, has anyone done this on a 350 and what size bolts and or nuts doe you reommend I pickup prior to starting this job?

    Thanks!!!

  2. #2

    Default

    Use bolts with the same threading, but of an appropriate length to go through the stand and get a full bite in the block. I would say use Grade 8 bolts, but if I do something involving bolts, I always use Grade 8 if it's available. I'd imagine Grade 5 would probably hold the motor up, but don't quote me on that. I think a fully built out 350 (block, heads, internals, and maybe even accessory mounts would weigh in the range of 500-600 pounds, so it's always better to go overkill than possibly lose a foot or other appendage to a falling motor.
    Christopher

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 265K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half



    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  3. #3

    Default

    Thanks! I'm going for Grade 8's to be safe.

    Do you happen to know the thread pitch and bolt site (diameter) of the bellhousing bolts?

    I'll spend some time toinght searching/googling at anyrate. Thanks!

  4. #4

    Default

    when you get the bolts off take one in to the store and have them match it up with the longer one you need

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  5. #5

    Default

    Sounds like a plan. I may try to take one off this week to get them by the weekend, so I don't have to drive to the parts store for the bolts later.

    Also, some searching found me this link: http://www.hotrodders.com/forum/bell...ze-157581.html

    Indicates 3/8 x 16 may be what I need in terms of diameter/thread pitch.

  6. #6

    Default

    Well last night I got under the truck and pulled one of the bellhousing bolts. (Not one of the converter inspection plate bolts, an actual bellhousing bolt). I think what I found online may be right - 3/8 x 16 thread pitch. But at anyrate I have it and will take it to the hardware store.

    It looks like on my engine stand I'll need bolts 3.5 inches long.

    We'll see what I can find in Grade 8

    Sweet!

  7. #7

    Default

    Don't sweat it if you can't find grade 8. Grade 5 will suffice. A grade 5 bolt is plenty strong enough.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  8. #8

    Default

    i just put my 350 on a stand a couple days ago. i used 3/8 coarse thread, about 2" long. they are grade five, and i used four. it is holding up very well.

    one thing to remember about grade 5 vs grade 8. grade 5, although weaker, will tend to bend on loads that are too heavy. a grade 8 bolt will tend to break in two pieces, once it reaches its max load. like i said....i used grade five, and it's holding up nicely.

  9. #9

    Default

    grade five are the recomended bolt for excatly that reason just make sure you get in at least 3/4 inch for a 3/8 to hold

    99 tahoe 2 dr. 4x4 7.4 4L80-e NP246, SAS, dana 60 hp, sterling 10.5 rear, gibson headers, and alot of tricks of the trade !!!!!!IF YOU'RE NOT CHEATING YOUR NOT TRYING!!!!!!!!

  10. #10

    Default

    I've been using grade 5 bolts for years. After all if the factory uses them to hold the transmission to the engine I would hope they would hold the engine to an engine stand.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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