Viewing 3 reply threads
  • Author
    Posts
    • February 15, 2011 at 10:44 pm #57679
      George Frizzell and Rita Bender
      Participant

        Hi everyone . Can someone please tell me the total max. cam lift at the valve and the duration @ 50 1000ths on a stock 260. thanks

      • February 16, 2011 at 3:10 pm #63941
        Joel & Karen Griffin
        Participant

          Lift.380 duration 250deg. @ 0 Lash you can use the 289 cam which was the lat 20 option,
          lift .457 duration 282deg @ .020 lash with the stock heads try and find this book Performance
          Tuning the Sunbeam Tiger (1967) has a lot of info from the early years.

          Joel

        • February 16, 2011 at 3:52 pm #63942
          George Frizzell and Rita Bender
          Participant

            Joel – thanks for the info. I am trying to get the right combination of new cam and al. heads to upgrade the performance (along with a 4 bl) without having to change the pistons. the goal is to keep it sreetable and run pump gas. any ideas would be really appreciated as i am new at this – george

          • February 16, 2011 at 10:17 pm #63943
            Joel & Karen Griffin
            Participant

              George:
              Its also my understanding that you can run the 289 heads, and a .040 head gasket,however the bigger valves require the pistons to be pocketed for the intake valve,hopefully this is correct info
              I’ve decided to run the stock heads and use a comp cams kit cam lifters springs etc from them.
              you should replace the rocker studs with the screw in type aparently this is a failing around 6k
              however with the stock heads a 1/4" needs to be taken off the stud boss to keep the correct ratio
              I talked to comp cams about a cam recommendation they gave me a spec has more lift than a 289 spec ,you need to clay a piston and run it thru to get the total clearance piston to valve this will tell you how much total lift you can run,also we are using an F4B and a 600cfm carb and a petronix dizzy
              comp cams liked that idea, also I talked to JE Pistons about pistons pricey at $1100 with pins & rings, Id like to run alloy heads also, however there may be an issue with the valve to piston.
              get that book I mentioned probably help a bit some one sent me one got a lot of info from days gone by.

              Joel

          • Author
            Posts
          Viewing 3 reply threads
          • You must be logged in to reply to this topic.