Oil consumption & smoke on a 327/350 hp - NCRS Discussion Boards

Oil consumption & smoke on a 327/350 hp

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  • Gene M.
    Extremely Frequent Poster
    • March 31, 1985
    • 4232

    #46
    Re: Oil consumption & smoke on a 327/350 hp

    Originally posted by Gerald Coia (11656)
    Okay, ready to address my pegged oil pressure gauge. I guess I'll pull out oil pump over the winter and where would I order the correct spring for my 327/350?

    In addition, I have another oil pump in my parts shelf that has a tag on it that states: DM55 98317A. Anyone know what this tag represents?
    Thanks,

    Jerry


    Even with the correct (I think it's green) spring in the Melling pump the pressure will be higher than was original. It will not pass PV in 67 class. You need to be about 10 to 15 lbs lower. This requires the spring be custom massaged. I will have a real original GM pump at Carlisle. Also should use a 10W30 weight oil. Higher than necessary oil pressure robs horse power.

    Comment

    • Joe C.
      Expired
      • August 31, 1999
      • 4598

      #47
      Re: Oil consumption & smoke on a 327/350 hp

      Originally posted by Gerald Coia (11656)
      Joe,

      Thanks! I just took the spring out of this pump and it looks like it was yellow and seems to be pretty "springy". Let me check this site out to see if they sells low pressure springs that would fit this DM 55 pump.

      Jerry
      Jerry,

      Springs are all interchangeable between manufacturers of that model pump. I have heard that you need the green spring, but as Gene indicates, judges vary in their "anality" (is that a word?) . BTW, I use the yellow one because I have plenty of stinkin' horsepower.

      Earl pressure also depends on your bearing clearances and whether or not the engine was rebuilt, as well as wear on the bearings, etc. Many cars back then used straight 30 weight oil. I think that if a judge breaks your balls if you have a green spring installed, that you should jump up and down and threaten to call your momma. I'd also put a hex on him/her.

      "Submitted for your perusal" as Rod Serling used to say:

      Last edited by Joe C.; August 13, 2016, 02:50 PM.

      Comment

      • Gerald C.
        Extremely Frequent Poster
        • June 30, 1987
        • 1276

        #48
        Re: Oil consumption & smoke on a 327/350 hp

        I just ordered the GM spring # 3814903. Based on what I've read on various posts, it is the correct spring for my 350 hp rebuilt 327. Here's hoping!

        Thanks

        Comment

        • Gene M.
          Extremely Frequent Poster
          • March 31, 1985
          • 4232

          #49
          Re: Oil consumption & smoke on a 327/350 hp

          Originally posted by Gerald Coia (11656)
          I just ordered the GM spring # 3814903. Based on what I've read on various posts, it is the correct spring for my 350 hp rebuilt 327. Here's hoping!

          Thanks
          You will be pulling the pan again when your oil pressure is way higher than The oil pressure specification of 40-45 psi HOT at 2000-up as Duke pointed out. The newer pumps put out more than the old 60's stuff...........

          The stock GM spring is stronger than the Melling green one as I compared the two.

          Comment

          • Duke W.
            Beyond Control Poster
            • December 31, 1992
            • 15633

            #50
            Re: Oil consumption & smoke on a 327/350 hp

            Originally posted by Gerald Coia (11656)
            I just ordered the GM spring # 3814903. Based on what I've read on various posts, it is the correct spring for my 350 hp rebuilt 327. Here's hoping!

            Thanks
            According to my '80 P & A catalog that is the correct spring for your application. The 55-60 psi spring used on late '63-up mechanical lifter SBs with 80 psi gages is 3848911.

            According to the catalog the ...907 has 21 coils and 2 7/32" free length. The ...911 is also has 21 coils, no free length specified, but it does say "stripe of white".

            Duke

            Comment

            • Gerald C.
              Extremely Frequent Poster
              • June 30, 1987
              • 1276

              #51
              Re: Oil consumption & smoke on a 327/350 hp

              Okay, one final question--If I install the new GM spring # 3814903, hopefully "green" should allow the oil pressure to be below 60 lbs. when cold????

              Jerry

              Comment

              • Joe L.
                Beyond Control Poster
                • January 31, 1988
                • 43198

                #52
                Re: Oil consumption & smoke on a 327/350 hp

                Originally posted by Gerald Coia (11656)
                Okay, one final question--If I install the new GM spring # 3814903, hopefully "green" should allow the oil pressure to be below 60 lbs. when cold????

                Jerry

                Jerry------


                It depends. If you install the spring in an original or replacement GM oil pump (possibly excluding the latest iteration, GM #93427692), it will produce correct oil pressure. At least, it will produce the same oil pressure that your engine produced when the car was brand new (regardless of what some may THINK it produced when new).

                However, if you install the spring in an aftermarket replacement oil pump, then I'm not so sure. I do not think that aftermarket replacement oil pumps use the same springs as OEM nor do they necessarily use the exact same internal parts/configuration as OEM.

                Find an NOS oil pump of GM #3764547 (the oil pump that was originally installed in your engine) or GM #12555284 and you'll have it right.
                In Appreciation of John Hinckley

                Comment

                • Gerald C.
                  Extremely Frequent Poster
                  • June 30, 1987
                  • 1276

                  #53
                  Re: Oil consumption & smoke on a 327/350 hp

                  Gene,

                  I will be going to Carlisle. Is your pump rebuilt or NOS? How much are you looking for for the pump?

                  Jerry

                  Comment

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