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Howard M4F cam specs? (Chevy 6)

Discussion in 'The Hokey Ass Message Board' started by 'Mo, May 10, 2013.

  1. 'Mo
    Joined: Sep 26, 2007
    Posts: 7,435


    I am sending out my 216 Chevy 6 cam for regrinding. There is not enough "meat" for the old dual pattern McGurk and Isky grinds. The cam is steel, and new cores are not available.

    Does anyone know the specs of the Howard M4F? How about other Howard grinds? The engine is heavily modified, and I'd like as much cam as possible.

  2. Truckedup
    Joined: Jul 25, 2006
    Posts: 3,864


    Oregon Cam Grinding has a a bunch of grinds available.So does Delta . They often have cores in stock. The M4F is a moderate grind, about 206 degrees duration at .050 lift and total lift is around .425
  3. gas pumper
    Joined: Aug 13, 2007
    Posts: 2,953

    gas pumper

    Intake opens 12 BTDC closes 46 ABDC
    Ex opens 46 BBDC closes 12 ATDC
    24 TDC overlap
    Lobe center 107
    Valve lift Intake .418 duration 238
    Valve lift Ex .418 duration 238

    Checking clearances at. .050 at cam:
    Intake lift .279 duration 206 opens -4 TDC closes 30 ABDC
    Ex lift .279 duration 206 opens 30 BBDC closes -4 TDC

    Installed springs closed @ 95 lbs

    This is right off the cam card for my M4F
  4. 'Mo
    Joined: Sep 26, 2007
    Posts: 7,435


    Thanks a hundred, Guys!
    Sounds like plenty of cam for the little 216.
    (Some extra exhaust duration might be nice.)
    Last edited: May 10, 2013

  5. Country Gent
    Joined: Feb 22, 2010
    Posts: 562

    Country Gent

    X2 on Oregon!!

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