LT1 manifold / carburetor details - NCRS Discussion Boards

LT1 manifold / carburetor details

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  • Fred H.
    Very Frequent User
    • December 4, 2019
    • 298
    #1

    LT1 manifold / carburetor details

    We're in the process of (correctly) detailing our 72 LT1 convertible ac for upcoming flight judging. Hoping to get input on several LT1 carburetor / manifold related details.

    1. Correct manifold (to cylinder head) washers, we received a judging comment that the washer are suppose to double tapered ?

    2. Correct finish on the fuel line Y block. Is suppose to be black ?

    3. Correct nut for the carburetor mounting base ? we received a judging comment that ours weren't typical because they are suppose to be a flange nut ?

    The attached photos are from an alleged 72 LT1 survivor (not our car), showing visual examples related to our questions ?

    5A.jpg3A.jpg2A.jpg1A.jpg
    Fred Hickey
    Care taker of Top Flight 72 LT1 C60 Convertible #26756

    Tags: 72 lt1
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    • Gary B.
      Very Frequent User
      • July 31, 1979
      • 926
      #2
      Re: LT1 manifold / carburetor details

      Not sure where you had the car judged. Chapter Meet? I have always been lead to believe we judge what is in the TIM&JG. If it's not in there, we are not suppose to be judged. Being the manual coordinator for the 70-72 TIM&JG, I'm always watching for error, mistakes, omissions in "the manual". Try to make it better?

      The intake manifold to cylinder head bolt washers were a thick washer very similar to the washers under the exhaust manifold bolts. They were not a thin flat washer. I've not heard of a double taper flat washer, nor is it called out in the TIM&JG. Inquiring minds would like to know what a double taper flat washer is ....

      Y-block's were orginally black. It was a sort of oxide plating, very thin and translucent. Over time, age, heat, solvents, oil, gas wore the plating off to a brass block. Birchwood Casey sells "Brass to Black" in a small plastic bottles that works real well. Some opinions that very early 70 LT1's were not black, but your car is a 72.

      Typically, I see flanged nuts on pretty un-molested LT1's. Were they replaced over the years with plain nuts when they were dropped and lost? Fig. M 5.26 and M 5.27 is a good example. I think GM used them to keep from digging into the aluminum base plates. But that's a guess on my part.

      Make the changes that make sense to you. Follow the TIM&JG. Have the car judged again, and if the judge deducts for something, ask where in the judging guide thats called out. If he/she can't show you, ask him how he can deduct for it then. I think that's a fair question to any judge, 400 level or not. If they (the judges) know more than what's in the TIM&JG's, They can make comments on the judging sheets, but deductions should not be made.

      My thoughts, opinions. I'm sure others will disagree. But that is the way I was trained.

      Gary Bosselman
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        • Fred H.
          Very Frequent User
          • December 4, 2019
          • 298
          #3
          Re: LT1 manifold / carburetor details

          We appreciate your comments and advise. While we believe a some of the deductions / comments were possibly just honest misinterpretations of specific component identified in the TIM&JD. We're still in the process of remedying annotated issues identified at the recent judging event and will consider challenging items we feel were judged inconsistent to the TIM&JG.

          Again we thank you for addressing the manifold washer, carburetor base nut style and Y-block color questions.
          Fred Hickey
          Care taker of Top Flight 72 LT1 C60 Convertible #26756

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            • Gary C.
              Frequent User
              • May 28, 2012
              • 66
              #4
              Re: LT1 manifold / carburetor details

              Fred,
              The comment was: "washers should not have chamfer". Not "double chamfer". Your washers are about 50% larger diameter than the typical washers used for 72 LT1. Typical washers are shown in Fig. M 7.7 in the TIMJG.

              Your nuts were the plain nuts, not typical flanged nuts as shown in Fig. M 5.26.

              Thanks,
              Gary Craig
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                • Fred H.
                  Very Frequent User
                  • December 4, 2019
                  • 298
                  #5
                  Re: LT1 manifold / carburetor details

                  Gary, thank you for response to my comments / questions regarding our 72 LT1. FYI my queries weren't intended to be adversarial or changeling to the judging process. In other words we misunderstood the annotated comments, and your clarification is very helpful. We believe we garnered significant advise & information that will help us get our 72 LT1 into the next level.
                  Fred Hickey
                  Care taker of Top Flight 72 LT1 C60 Convertible #26756

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                    • Gary C.
                      Frequent User
                      • May 28, 2012
                      • 66
                      #6
                      Re: LT1 manifold / carburetor details

                      Fred,
                      All good. If you don't mind, please send me a photo of your judging sheet Mechanical pg 1 that has the remarks on intake manifold bolt/washer so I can see how/what I wrote for future clarity purposes. Please send to: judging@arizonancrs.com

                      When/which event will you take your gorgeous 72 LT1 to have it judged again?

                      Thanks,
                      Gary
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