Original 1970 gas tank bolts?

Discussion in 'Original Drivetrain Topic' started by DCL70, Aug 1, 2011.

  1. DCL70

    DCL70 Veteran Member

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    I bought a pair of used gas tank straps w/bolts at a swap meet thinking that they were from a 2nd generation Camaro. Each strap had a white sticker with part number 3914867 which turned out to be for 1968-1972 Novas after checking in my vintage Chevrolet parts catalogs. When I checked my 70 Camaro and 70 Nova assembly manuals I found that both cars used the same gas tank bolts, GM # 3913468. Apparently the 3913468 bolts were used on many models. The parts catalog describes the bolts as 3/8"-16 X 3 3/8" Rd. Hd., Sq. neck (basically carriage bolts) which check out with the bolts that I bought (photo below). The bolts have the letter "M" with 3 radial lines (SAE grade 5, I assume) and are pointed at the other end. I know that these bolts are GM # 3913468 but are they the same as original 1970 gas tank bolts with the "M" (Michigan Bolt Company, I assume)?

    Dave
     
    Last edited: Sep 13, 2011
  2. 70 SS/L78

    70 SS/L78 Veteran Member Lifetime Gold Member

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    Dave, the original mounting bolts from my 03C Norwood car are basicly the same length (3.360") as yours but the head markings are different. Mine are marked with the letter 'N'. The spacer measures .400 ID x .630 OD x 1.132" long..... Of course once installed you'll never see it.

    [​IMG] [​IMG]
     
  3. DCL70

    DCL70 Veteran Member

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    Scott,

    I took a better look at my bolts with a magnifying glass and the letter does look more like the letter "N" (or more like a slightly smudged "N"). I just assumed it was the letter "M" as my 1966 Corvette has bolts with the letter "M".

    The 396713 washers (or spacers) measure about 1.12" O.D., 0.59" I.D., and 0.16" thick.

    The washer head type nuts have a forged "II" or "11" (actually 2 parallel line segments) on each of them on the edge.

    I am missing the spacers but according to the 1970 Camaro Assembly Manual (UPC 8, sheet B3) the 3992539 spacers were added 3-3-70 as per the revision record.

    Thanks,
    Dave
     
  4. DCL70

    DCL70 Veteran Member

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    Scott,

    In searching for some other parts in my garage attic I came across a pair of used gas tank straps in very good condition with complete hardware that I apparently bought on Ebay several years ago tagged "70 Camaro, Ebay". Each strap in stamped "3965632". The carriage type bolts (3/8"-16 X 3 3/8") have the letter "A" with 3 short radial line segments (grade 5). The spacers (GM # 3992539) each measure 0.63" O.D., 0.43" I.D., 1.12" long. The washer head type nuts (GM # 1361640) each have 3 "dots" (or small "bumps"). The lag bolts (GM # 9420065) have a washer type head for a 3/8" wrench with "RBW" and the effective length is 1.0". All of these parts are at least originally from a 1970-1973 Camaro. I at least know that my other "N" bolts are correct for a 1970 Camaro. The "A" bolts may or may not be correct for a 1970.
    Thanks again for your help.

    Dave
     

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