Motor plate bolt
+ Reply to Thread
Results 1 to 13 of 13

Thread:
Motor plate bolt

  1. #1
    Senior Member Scapegoat's Avatar
    Join Date
    Feb 2008
    Location
    SoCal
    Posts
    1,060

    Default Motor plate bolt

    Need help on what size/grade bolts to buy for a 396 chevy front and rear motor plate
    thanks

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member steele211's Avatar
    Join Date
    Nov 2008
    Location
    Kingsburg,CA
    Posts
    426

    Default

    Bolt to motor or bolt to rail kit?

  4. #3
    Senior Member Scapegoat's Avatar
    Join Date
    Feb 2008
    Location
    SoCal
    Posts
    1,060

    Default

    Bolts to mount engine plates

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    there enough of the bolts and their size is large enough that plastic would almost work. When it gets to the ones holding the plate to the rail, thats a little different.
    I always run SS allens to hold the motor plate to the engine and never failed one yet.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  7. #5
    Senior Member Scapegoat's Avatar
    Join Date
    Feb 2008
    Location
    SoCal
    Posts
    1,060

    Default

    Thread pitch and length?

  8. #6
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by Scapegoat View Post
    Thread pitch and length?
    I take it this is a Chevy!
    7/16-14 in the front
    3/8-16 bellhousing

    You REALLY want me to tell you how long? I'll tell you when you can tell me what size tires my trailer needs. Getoutamuthafuckntape!



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  9. #7
    Senior Member
    Join Date
    Feb 2008
    Posts
    5,829

    Default

    Quote Originally Posted by Scapegoat View Post
    Thread pitch and length?
    I agree with GN7 on the stainless.

    I have always used 3/8-16 for the diameter. The length will vary with how its being mounted.
    In my opinion and the way I have done it for years is to measure the thickness of the material being bolted together and then buying the bolt that is long enough to have a solid shoulder or shank with a length equal to or very slightly less than the two parts being held together.
    Washers can be used as shims if the shank is only slightly long and if only a few are used.
    Make sure the bolt clamps the material and the nut doesn't just tighten up on the threads at the shank because it's too long.

    Usually a bolt like this ends up being overly long, but the excess threads can be cut off for a normal appearance.
    In many cases each mount will have it's own custom bolts.

    If the bolt used is solid thread, there is very little contact surface and will eventually chew up the hole and not be a good fit.
    You can usually drill or ream the hole to the next larger size if necessary and then use the correct size bolt with a shank.

  10. #8
    Senior Member
    Join Date
    Feb 2008
    Posts
    5,829

    Default

    Quote Originally Posted by gn7 View Post
    I take it this is a Chevy!
    7/16-14 in the front
    3/8-16 bellhousing

    You REALLY want me to tell you how long? I'll tell you when you can tell me what size tires my trailer needs. Getoutamuthafuckntape!
    Thats funny, but it's a correct answer.

  11. #9
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by jimsplace View Post
    I agree with GN7 on the stainless.

    I have always used 3/8-16 for the diameter. The length will vary with how its being mounted.
    In my opinion and the way I have done it for years is to measure the thickness of the material being bolted together and then buying the bolt that is long enough to have a solid shoulder or shank with a length equal to or very slightly less than the two parts being held together.
    Washers can be used as shims if the shank is only slightly long and if only a few are used.
    Make sure the bolt clamps the material and the nut doesn't just tighten up on the threads at the shank because it's too long.

    Usually a bolt like this ends up being overly long, but the excess threads can be cut off for a normal appearance.
    In many cases each mount will have it's own custom bolts.

    If the bolt used is solid thread, there is very little contact surface and will eventually chew up the hole and not be a good fit.
    You can usually drill or ream the hole to the next larger size if necessary and then use the correct size bolt with a shank.
    You just gave the perfect discription for a plate to rail/footblock bolt. I think he asked about the plate to engine bolts.
    But it was a good post none the less



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  12. #10
    Senior Member tigertooth's Avatar
    Join Date
    Mar 2008
    Posts
    877

    Default

    Quote Originally Posted by jimsplace View Post
    I agree with GN7 on the stainless.

    I have always used 3/8-16 for the diameter. The length will vary with how its being mounted.
    In my opinion and the way I have done it for years is to measure the thickness of the material being bolted together and then buying the bolt that is long enough to have a solid shoulder or shank with a length equal to or very slightly less than the two parts being held together.
    Washers can be used as shims if the shank is only slightly long and if only a few are used.
    Make sure the bolt clamps the material and the nut doesn't just tighten up on the threads at the shank because it's too long.

    Usually a bolt like this ends up being overly long, but the excess threads can be cut off for a normal appearance.
    In many cases each mount will have it's own custom bolts.

    If the bolt used is solid thread, there is very little contact surface and will eventually chew up the hole and not be a good fit.
    You can usually drill or ream the hole to the next larger size if necessary and then use the correct size bolt with a shank.
    As an engineering rule of thumb. The depth of the bolt in the threads should be equal or slightly more than the diameter of the bolt. 3/8 == 3/8 in the hole. 1/2 = 1/2 in the hole. Thats why 3/8" nuts are approximately 3/76ers" thick. Hope this this helps.

  13. #11
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,814

    Default

    Quote Originally Posted by tigertooth View Post
    As an engineering rule of thumb. The depth of the bolt in the threads should be equal or slightly more than the diameter of the bolt. 3/8 == 3/8 in the hole. 1/2 = 1/2 in the hole. Thats why 3/8" nuts are approximately 3/76ers" thick. Hope this this helps.
    Now that is an education post right there!!! Good Job T/T. BTW 8 bolts @ 3/8 and 1 @ 7/16 all coarse thread depending on were the front mount bolts and depth_______ you already got a good come back on that!

  14. #12
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by ol guy View Post
    Now that is an education post right there!!! Good Job T/T. BTW 8 bolts @ 3/8 and 1 @ 7/16 all coarse thread depending on were the front mount bolts and depth_______ you already got a good come back on that!
    OK Ol guy, can you descripe were those bolts go in the block?
    Every BBC Chevy I have ever mounted took 6-3/8 on the bellhousing(7 if it has a top center bolt) and 4- 7/16 on the front.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  15. #13
    Senior Member Scapegoat's Avatar
    Join Date
    Feb 2008
    Location
    SoCal
    Posts
    1,060

    Default

    I'll go get a tape measure and my sign, lol

    But really thanks....

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95