"SEMS" bolts with captured LW used to secure upper PB booster - NCRS Discussion Boards

"SEMS" bolts with captured LW used to secure upper PB booster

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  • Fred Y.
    Very Frequent User
    • April 30, 2000
    • 319
    #1

    "SEMS" bolts with captured LW used to secure upper PB booster

    I am nearing the end of my 2.5 yr journey on my 67 garage find coupe. Honestly ,I think once finished I'll miss these evenings working on her in my shop.I am now bolting the PB booster back on tonight. Anyways the original power brake booster was on my car (since parked in 92) & being original I believe it was NEVER removed. The 2 bolts holding it to the firewall at top of the booster have the "SEMS" headmark with a captured lock washer. The JG manual mentions no such bolt that I see. Have any of you seen the same as I have ?

    Always appreciate the advice.
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    • Edward J.
      Extremely Frequent Poster
      • September 15, 2008
      • 6940
      #2
      Re: "SEMS" bolts with captured LW used to secure upper PB booster

      Fred, I am not a 67 guy but the SEMS head mark is surely era specific for the Mid years, what I have see is a 3/8 indented head with a captured lock washer on the booster brackets. Head marks likely vary as with most Corvettes.
      New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.
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        • Fred Y.
          Very Frequent User
          • April 30, 2000
          • 319
          #3
          Re: "SEMS" bolts with captured LW used to secure upper PB booster

          That is exactly what I have Ed; 3/8" indented head with a captured lock washer on each bolt. Can anyone else chime in ?
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            • Peter M.
              Very Frequent User
              • May 30, 2013
              • 358
              #4
              Re: "SEMS" bolts with captured LW used to secure upper PB booster

              Fred,
              These were on my car. I don't think they have ever been replaced but I can't say for certain.
              There was probably more than one supplier.
              Kind Regards
              Attached Files
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                • Fred Y.
                  Very Frequent User
                  • April 30, 2000
                  • 319
                  #5
                  Re: "SEMS" bolts with captured LW used to secure upper PB booster

                  Yes Pete, the JM definitely mentions the anchor as well as "E" headmarks. In my case the master was completely original, & I could tell from below inside that the nuts from the studs had never been removed---Why would they if it was the original master ? I suppose this is more curiosity than anything, but that's my story & I'm stickin to it !
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                    • Gene M.
                      Extremely Frequent Poster
                      • April 1, 1985
                      • 4232
                      #6
                      Re: "SEMS" bolts with captured LW used to secure upper PB booster

                      You have a “good” bolt/application. The “sems” as well as others RBW, SEMS, anchor, and -E- in this application are all viable bolts. I’m sure other’s could fall in as well as indented head bolts, possibly -P- too.
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                        • Fred Y.
                          Very Frequent User
                          • April 30, 2000
                          • 319
                          #7
                          Re: "SEMS" bolts with captured LW used to secure upper PB booster

                          Great info Gene. Thanks much.
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