starter bolts?

Discussion in 'Street/strip 400/430/455' started by 12lives, Oct 9, 2017.

  1. 12lives

    12lives Engage! - Jean-Luc Picard

    None of these match up exactly with what I have - which ARP bolts would you use on a 455? Are they the same on a 350?
    430-3508 GM O.E. 3/8-16 x 1.975”/4.660” Stainless Steel 12-Point Starter Bolt Kit
    430-3509 GM O.E. 3/8-16 x 4.660” Stainless Steel 12-Point Starter Bolt Kit
    430-3511 GM O.E. 2-Long M10 x 4.470” Stainless Steel 12-Point Starter Bolt Kit
    430-3512 GM O.E. 2-Long M10 x 4.470” Stainless Steel Hex Starter Bolt Kit
    430-3513 GM Aftermarket 3/8-16 x 4.400” Stainless Steel 12-Point Starter Bolt Kit
    430-3514 GM Aftermarket 3/8-16 x 4.400” Stainless Steel Hex Starter Bolt Kit
    430-3515 GM Aftermarket 3/8-16 x 1.750”/4.400” Stainless Steel 12-Point Starter Bolt Kit
    430-3516 GM Aftermarket 3/8-16 x 1.750”/4.400” Stainless Steel Hex Starter Bolt Kit
     
  2. Stevem

    Stevem Well-Known Member

    None of the above, I would use a Ames performance PN425D which has the correct size shank and built in washer.
     
  3. Schurkey

    Schurkey Silver Level contributor

    Which bolts you use depends on what starter you have. Without that info, there's no way to tell. Various starters have longer or shorter bolts, and the bolt hole in the starter can be at least two different diameters.

    Certain mini-starters need a step-shank bolt: Metric through the starter, SAE into the block.

    Time for you to measure your starter motor: shank length and hole diameter.

    The holes in the block should be threaded for 3/8-16, so you can rule out the metric-threaded bolts.

    Hex head vs. 12-point is a matter of personal preference.
     
  4. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    you can buy starter bolts in the "help" section at any parts store. bring your starter and buy what you need
     
  5. 12lives

    12lives Engage! - Jean-Luc Picard

    Sorry - Should have said it is for an OEM starter. I was looking for something better that the "help" parts and figured ARP would do the trick.
     
  6. Schurkey

    Schurkey Silver Level contributor

    One long, one short bolt for a bigass heavy 1960s--1970s 10MT starter motor?

    Almost certainly ARP 430-3508.

    HOW is the 3508 different from "what you have"?

    Yes, should be the same on a 350.
     
  7. 12lives

    12lives Engage! - Jean-Luc Picard

    Good question - The 3805 is 1.975 and 4.660. I measure mine at 4.625 and 1.75, so the 4.66 is close. They sell a 1.75 bolt but it is paired up with a 4.40 bolt. Also, the position of the knurl is important as it should bridge the joint, 1/2 in the starter and 1/2 in the block.

    And the 340 is the same as the 455, I checked mine. I am using these on a RobbMc starter and it is supposed to use OEM 10MT bolts, not the metric LS bolts.
     
    Last edited: Oct 10, 2017
  8. Schurkey

    Schurkey Silver Level contributor

    Do the ARP bolts use a washer that would take up some of the extra length?

    Yes, the knurl needs to be half in the starter and half in the block. Thread length is therefore important because it affects the knurl position. Excess shank length can be eaten-up with additional washers if absolutely essential.
     
  9. 12lives

    12lives Engage! - Jean-Luc Picard

    I am concerned that my old bolts are worn and will not fit as tight as they should. I found a chevy thread that had some part numbers in it and I went to the local chevy parts counter armed with the data. The parts manager drags out an old Buick parts book, yes, hard copy!!! Apparently he likes to help out with the old cars. The numbers were the same. They came in today and I compared them to my original ones:

    Short bolt: Knurl Shaft Length PN Cost
    New .380" .374" 1.80" 14097279 $6
    Old .380 .374 1.83

    Long bolt
    New .382 .379 4.643 14097278 $8
    Old .379 .373 4.666
    Dorman .373 .372 4.660
    ("Help")

    The short bolts are almost identical
    The long bolts are close, but the new one has better specs.
    The Dorman is the auto parts Help section offering(PN 656-1543 NAPA). Clearly inferior. Made in U.S.A.!
    New factory bolts are not cheap. I could have saved some money and just used the old ones! At least I have confirmation. IMG_0084[1].JPG IMG_0085[1].JPG IMG_0092[1].JPG

    Here are the pictures. Note the knurl on the new long chevy bolt is very short. That's a concern even though it is a tighter fit. I am not sure if I will use it. It will depend on how the knurl falls at the joint. The Dorman has hardly any knurling. It is more like scratches.
     
  10. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    dang. bolt the thing up there already and worry about something else!
     
  11. 12lives

    12lives Engage! - Jean-Luc Picard

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