C3-LT1 Motor story (cont.) good news! - NCRS Discussion Boards

C3-LT1 Motor story (cont.) good news!

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  • Peter M.
    Expired
    • April 1, 2003
    • 137

    C3-LT1 Motor story (cont.) good news!

    To all,

    Previously sent posts on my 71 LT1 Corvette I bought year ago from Mershons. Over the years I have owned 5 GTO's and 1 66 SS396 so am aware of stock musclecar power. LT1 never seemed to run like I remember or thought it should(it was a dog actually). A shop did a Compression test and said I was 90lbs across the board-I would need a rebuild. I wrote to this board asking for advice and was told that 90 even was very unusual and should go back and dblchk. I did with shop but they said that was the deal. Thankfully you instilled enough doubt in me to seek 2nd opinion. Not knowing where to go,out of the blue,based on my GTO knowledge, I contacted a famous Pontiac Performance Engine builder(been in Pontiac magazines for years)name Jim Taylor expecting him to tell me he works on nothing but Pontiacs. He surprised me and said he has worked on every motor including LT1's. Long story short - did "cold" comp test and found ranged 120-130, no smoke, readjusted all valves, put restored Holley back on, pulled distributor and installed performance recurved distributor and put in Petronics unit(since Transistor Ignition not in car). Car screams!!! Not only is he the genius I knew from Pontiac but was floored with his honesty-had my car 3 days and charged only 8.5 hours of work-he could have easily said he worked on my car the entire 3 days - I would have never known the difference. So if your Vette is not running right and you are near the North Jersey Pennsylvania area, contact Jim Taylor Engines at 908-213-3456 120 S. 5th Street, Philipsburg, NJ 08865 He and Nunzi in Brooklyn are the best Pontiac guys I knew about - now I know Jim handles Vettes too, and Hemis, etc. Thanks a million to all who responded and put me on right track!!!! I can really enjoy the LT1 now!!
  • Chas Kingston

    #2

    Comment

    • Peter M.
      Expired
      • April 1, 2003
      • 137

      #3
      Re: C3-LT1 Motor story (cont.) good news!

      Knew that because that is exactly what Jim Taylor said because he had just worked on a 70.

      Nevertheless, certainly seems to be pulling close to mid 14's to me - of course talk is cheap - will let you know if I get to Englishtown.

      Question for you - I would love to have a 70 - how do you run that on today's gas with the 11.0 to 1? How would you recurve the distrib and deal with the gas? Let me know in case I ever switch to a 70(which I will probably do some day). I bought a 71 because I was under impression you could NOT run a 70 today effectively but I am probably wrong as usual so, plese, keep me informed.

      Oh yeah - one other point - ususally I get positve news from this board - raining on my parade ain't happening but maybe I am just too darn sensitive!!!

      Comment

      • Warren F.
        Expired
        • December 1, 1987
        • 1516

        #4
        Re: C3-LT1 Motor story (cont.) good news! *NM*

        Comment

        • Warren F.
          Expired
          • December 1, 1987
          • 1516

          #5
          Re: C3-LT1 Motor story (cont.) good news!

          Peter: Glad your small block(rat)is running STRONG! I've got the big block rat and the factory 9 to 1 compression doesn't slow it down much. Enjoy!

          Comment

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

            #6
            Re: C3-LT1 Motor story (cont.) good news!

            Peter:

            I hate to be the bearer of bad tidings, but my 1965 327/365 runs just fine on straight hi test (93 octane--never ran Sunoco Ultra, but it wouldnt hurt, or help either). I think you will hear this from lots of folks with SHP mousemotors. I built/blueprinted the engine myself, and calculated the ACTUAL compression ratio @ 10.65:1, plus or minus .15. That is because the advertised compression ratio "in the old days" was somewhat exaggerated.Anyway, the reason that my engine (and most other SHP engines) does not detonate, is because of the generous valve overlap designed into the camshaft. This causes the DYNAMIC compression ratio to be much more octane tolerant than some of the milder engines with less overlap and LOWER c/r's.
            That is a simple explanation, but Duke or John H. can give you more details.

            Joe

            Comment

            • Chas Kingston

              #7
              Re: C3-LT1 Motor story (cont.) good news!

              Aw, Peter, I was just yanking your chain.

              On a more serious note, my '69, upgraded to 350/370 ran 14 flat on street tires and closed exhaust (in 1970). My '70 350/370 did the same (in 2001), after I had the original heads rebuilt w/ hardened seats and ss valves. It really got legs at about 4000 rpm. My '71 350/330, by comparison, was only a so-so machine. Better than the base engine, but not like the high compression engine.

              In Re: 93 octane. My '70 ran OK. I never made a comparison to AvGas, but it ran just fine on the street. I suspect that I could have dialed in a bit more advance w/ 100 octane, however. One point -- the valve seats were in bad shape when I had the heads rebuilt, from lack of lead to lubricate them.

              Geezer

              Comment

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