Staged'2Discover's 71 GS Stage 1

Discussion in 'Members Rides' started by Stg'd 2Discover, Jul 7, 2010.

  1. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    Back to the cam.
    I now have two 308S cams.
    A completely refurbished old one, with some added intake duration and the recent replacement version. Can you visually tell them appart from the side by side pics? Both came from the same cam grinder. Actually the better looking one is the regrind. It's core's clean appearance was detailed with lobe side clearance machining.

    Both shafts were checked and degreed at cylinders 1 & 6, checked for runout, warpage and consistency of timing events and lifts between cylinders. I 'm a stickler for this kind of detail. (must be my mechanical engineering background) The final plan is to use the old one with 270 intake duration, set up at a 106 intake CL. This works out to be a 2 degree advance on the .005 oversize rollmaster timing set. (Remember I had it line honed.)

    The Stef's pan and pickup are now in transit.

    Tom
     

    Attached Files:

    Last edited: Jun 11, 2011
  2. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    Here it is, fresh from delivery; "Stef's aluminum BBB Oil Pan to work with the Finishline Halo"

    Stef's made this from the halo installation photo's, some phoned in measurements, and in conjuction with their BBB test blocks.

    I wanted good oil control and to use the existing AMP crank scraper so the pan was designed accordingly. The goal was not to just get a nice looking plan providing clearance without oil management. I would have then kept the clearanced KB pan.

    Here's how it came out:

    Aluminum (.090 gage) 100% Tig welded inside & out
    .250 Thick pan rails
    Sump reinforcement plates front & back (a la Super Comp/Gas/ FC pans)
    An increase in capacity without an overly deep sump that would be exposed to road debris
    With an Acceleration baffle
    With a Deceleration baffle
    With a Trap door assembly having deaeration ports
    With a Teflon coated unidirectional windage screen in the sump area
    With a sturdy Matching Pickup to clear the Halo
    And a Magnetic drain plug.

    So far everything looks good. The dipstick hole in the windage screen was decided to be field cut depending on how the dipstick actually located past the Halo. (my choice)

    These guys know all kinds of oil management from Nascar to Top fuel and do very nice work.:TU:

    Now its final assembly time.

    Tom
     

    Attached Files:

    Last edited: May 25, 2011
  3. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    Motor's together, installed and we broke in the cam in on Father's day. Just need to install the inner valve springs, some tuning and then try it.

    A few pic's in getting to where I am now.

    Tom
     

    Attached Files:

  4. ralph sr.

    ralph sr. Well-Known Member

    Awsum job! Good luck to you.:TU:
     
  5. td99

    td99 Well-Known Member

    Tom what size valve spring are you using?

    Cody
     
  6. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    Cody,

    I'm using a Comp Cams 1.55 double spring installed at 1.900 giving me 130psi on the seat. Lift is around .600 at 300 psi and change on the nose.


    Tom
     
  7. td99

    td99 Well-Known Member

    did you have to clearance the rocker arms at all Tom?
     
  8. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    With the Bulldog heads the spring side of the Rocker was fine.

    In the begining I used 3/8 pushrods and had to clearance on the pushrod side. Later switched to T/A 5/16 and these are working well. If you have TA or stock heads you'll need to clearance on the spring side with those diameter springs.

    Tom
     
  9. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    Just an update,

    The engine's running fine with the mods, but I did have some starter issues for a while. The battery ground cable ran into some resistance issues after break in.

    Oil Pressure cold goes to 96 psi at 2000 rpm . Warm stays between 25 to 33 psi using Rotella. and has at least 12 psi per 1000 rpm. Also keeping in mind this motor is not a tight bearing motor.

    Also the orignal issue three circuit 9375 dominator is not a low rpm cruise friendly carb and does tend load up rich at light cruise rpm. It's excellent though for pure stab & steer. I didn't want to modify the good race carb characterisics so I switch from the 4500 Dominator and a 1050- 4150 body Quick Fuel for cruising.

    Tom
     
  10. 70purplerag

    70purplerag Silver Level contributor

    Off topic but what color is your car Tom? Looks great. I am using the stage 2 scoop on my car and looking for a great blue color. Do you have any larger picks?

    Sound like a blast to drive, enjoy it!

    Kevin
     
  11. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    Kevin
    The color is a 02 Mopar truck blue. It suits an A Body GM

    Attached Pic from last year.

    Tom
     

    Attached Files:

  12. Stg'd 2Discover

    Stg'd 2Discover Lumpty, Lumpty, Lumpty

    Further to the above the Mopar paint code is PB3

    Tom
     

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