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  1. L21 Pcm..

    Just returned from a trip to Bend, Oregon, driving
    our L-21 P12 Coach...Drove it 400 miles and used
    40 gallons of gas..not bad mileage. But I had to
    get it back to the Paint Shop right away and...
  2. Why the P12/L21 FSM ain't so popular..

    The Manuals aren't popular because of the rarity
    of the P12/L-21 combo. I Moderate a Yahoo! Group:
    The P12 Chassis Group, and I have but 8 Members,
    it is a discussion group for Owners of the P12,...
  3. No help from the GM P12 Service Manuals..

    Dammit--

    There are no Part Numbers in my three-volume
    P12 Chassis Service Manuals (?).

    I thought I'd just "cut a fat hog" and simply look
    up the crankshaft in the book..no such luck.
    My...
  4. The #14096983 Crankshaft...

    I found a Web-site that claims the L21 has a
    forged steel crankshaft. Same as a Marine 454
    in a boat. The crank's GM Part # is 14096983..maybe
    also forged rods..I am busting my buns on this
    end...
  5. L21 engine code---

    When I type in our P12/L21's VIN at ACDelco.com
    it tells me it has an engine code of "B"...
    but some of the parts shown are not L21
    specific..for some examples: It shows a
    distributor rotor (L21s...
  6. Our P12's Build Sheet...

    Our VIN and Build Sheet is over on the Diesel
    Place/Duramax Forum in the Vin Request Sub
    Forum. Look for a request from Steady Eddie.

    If you see a Motorcoach, of any Brand name,
    that looks as...
  7. L21 differences from the L29...

    Well, the two engines ARE different. If you go
    to the Mr. Goodwrench Crate Engines Web-site
    you will find the L21 listed on page 4 and GM
    calls it there a "performance" engine, whatever
    that...
  8. L21 vs. L29...

    I think we both need to look at the camshaft specs
    and compare the L21 to the L29..I can't find the
    numbers on lift and duration for the L21 camshaft
    anywhere online..odd..my L21 has 405 ft.lbs....
  9. L21 PCM Part Numbers...

    Our P12 is now 30 miles away, at a body shop.
    When we get the Coach home, I can get
    to the PCM easily. It is bolted to
    the driver's side radiator frame, right on top.
    I can get you the numbers....
  10. The L21 Vortec...

    I've got one. Let me know if I can help.

    Steady Eddie
    L21/Allison
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