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  1. Micheal Tomac

    SoCal 6460 cam vs SoCal 6480 cam

    Anyone know the difference between the SoCal 6460 cam & SoCal 6480 cam
  2. Micheal Tomac

    LB7: What cam would be the best for 2.6 SB pulling truck using Allison trans?

    New motor build using some stuff from the old motor. This is what I have so far. I’ll hung up on what cam to use & AF or not. New LML block o-ringed - 4.1 bore with billet main caps Mahle Forged aluminum pistons - 17.5:1 compression ratio Billet SoCal narrow rod journal crank Narrowed Crower...
  3. Micheal Tomac

    Which billet crank?

    Which one is better? SoCal billet crank or Callies internally balanced billet crank?
  4. Micheal Tomac

    LML LML short block potential

    How much horsepower & torque will an LmL block & crank handle with aftermarket rods, pistons, main studs & AF cam? On a fresh build is it worth upgrading to a Callie’s Durastar crank?
  5. Micheal Tomac

    Allison 6sp: 2017 Allison EPC solenoid delete plug

    2017 Allison EPC solenoid plug Does the 2017 Allison still need this to keep line pressure up at all times?
  6. Micheal Tomac

    Allison 6sp: 2017 Allison TCM

    The 2015.5 and 2016 Allison uses the T87 TCM. What TCM does the 2017 Allison use?
  7. Micheal Tomac

    LB7: Pensacola diesel, SPD, Dorman high pressure fuel ines

    Anyone used any of these high pressure fuel lines for th Lb7?
  8. Micheal Tomac

    Gooseneck hitch

    Does anyone have the factory GN hitch on their truck? If so is it factory installed or dealer installed?
  9. Micheal Tomac

    L5P not available until July

    Anyone know what the supplier and parts issues are? Why is the Chassis Cab not affected? What is the difference between restriction and constraint in GM production? 2017 Chevrolet Silverado / GMC Sierra 2500HD and 3500 Regular Cab - Diesel engine L5P not available until July due to supplier...
  10. Micheal Tomac

    11.5 AAM Dodge 2500 axle shaft vs 11.5 AAM GM 2500HD axle shaft

    The Dodge axle shaft is 22mm longer than the GM, but is the flange bolt pattern the same?
  11. Micheal Tomac

    LB7: B1014 b1015 b1016 b1017 b1018 b1019

    It makes no sense how tables B1014 B1015 B1016 B1017 B1018 B1019 are all over the place at different RPMs. Watching my FRP Regulator Commanded % my regulator seems to be a little too quick to make an adjustment when actual fuel rail pressure is a little higher than commanded. It will over...
  12. Micheal Tomac

    When looking Main Injection Pulse table while playing log file...

    When looking at Main Injection Pulse table while playing log file... why does it only highlight the 190 MPA column on the far right when looking at the tune while playing the log file. The tune is not calling for 190 mpa and I'm logging GM.FRPACT and GM.FUELQ_MAIN_DMA
  13. Micheal Tomac

    2016 pulling videos

    https://www.youtube.com/watch?v=RlkXf_E1lTo 1st of 10 trucks in the MTTP 2.5 Prostreet Diesel class 309'
  14. Micheal Tomac

    Lucas 15w40 Magnum CI-4 oil

    Anyone using it? http://lucasoil.com/products/heavy-duty-trucking/lucas-15w-40-magnum-high-tbn-ci-4-oil http://lucasoil.com/pdf/TDS_Lucas-15W-40-Magnum.pdf TBN is 13 and zinc is 1524
  15. Micheal Tomac

    Colorado diesel test drive

    I test drove a Colorado diesel last Saturday. Having never driven a new Colorado or Canyon before I was not surprised that it was light years ahead of the previous generation in ride, handling, interior quality and styling. The Colorado diesel I drove was a red CCLB 4x4 Z71 with 3.42 axle ratio...
  16. Micheal Tomac

    LB7: Duramax pulling videos

    Check out my youtube page for pulling videos from the past several years. https://www.youtube.com/channel/UCX1HgZOoHVOhfX3KFS0o5rA
  17. Micheal Tomac

    TCM H0105 speed sensor pulses per mile doesn't match ECM H0101 vss pulses per mile

    In a stock Allison 5 speed TCM H0105 is 4000 and in the Duramax LB7 ECM H0101 is 101605. Why don't these two match? Also why is the TCM final drive ratio H0103 4.10 when all Duramax truck have 3.73 gears
  18. Micheal Tomac

    LB7: can EFI Live V1 flash a .ctz file

    Don't have the V2 with me luckily the V1 was in the truck. Can a V1 flash a .ctz file instead of the normal .tun file?
  19. Micheal Tomac

    Duramax pulling videos

    check out my youtube page for my pulling videos http://www.youtube.com/miketomac So far I've finished 1st four times, 2nd four times and 3rd twice only getting beat by other Duramax trucks.
  20. Micheal Tomac

    17" GM steel dually wheels I.D. & backspacing

    Anyone know the inside diameter of the hub bore on a stock 17" GM steel dually wheel? Also how many inches does the wheel center stick out from the outside edge of the rim? (opposite of backspacing)
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