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Small Block Ford factory cam specs?

Discussion in 'The Hokey Ass Message Board' started by Untame, Jan 18, 2012.

  1. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    Does anyone have a link to camshaft speciications for factory Ford cams? In particular, I'm trying to find the int/ex duration, LSA, and intake centerline of a 1974 302 cam.

    Thanks!

    Untame
     
  2. George
    Joined: Jan 1, 2005
    Posts: 7,287

    George
    Member

    Don't know, but on a '74 it's going to be pretty lame.
     
    JeffB2 and Deuces like this.
  3. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    Thanks, George. I'll plug "pretty lame" into my software and see what I get.

    Untame
     
    Beanscoot and Deuces like this.
  4. shinysideup
    Joined: Sep 1, 2008
    Posts: 1,627

    shinysideup
    BANNED
    from ruskin, fl

    Search "who cares?" if that doesnt work for you.

    You get these kind of answers when you have no info at all and want specifics. Do you realise how many different cam profiles Ford made that year alone?
     

  5. Dapostman
    Joined: Apr 24, 2011
    Posts: 294

    Dapostman
    Member

    I think I have them in an old Petersen's manual. I don't have it here, but I should be able to get it tomorrow.
     
  6. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    No, I don't realise how many different cam profiles Ford made that year alone. I'm all ears. Tell me where I can find a grind number on the cam. I've looked -- maybe it is under varnish somewhere.

    Thanks for helping. :)

    Untame
     
  7. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    That would be awesome! Thank you!

    Untame

    PS -- I'm surprised nobody has put a table/database online. Maybe it is because most guys just get an aftermarket cam rather than tuning their factory cam.
     
  8. fordor41
    Joined: Jul 2, 2008
    Posts: 921

    fordor41
    Member

    I just went thru the same thing. Research the stock cam thru Autozone, advance auto etc, if you know what model it is for, like T-bird,mustang.
    If you find it listed, the specs. should be there.
     
  9. savannahDan
    Joined: Nov 26, 2008
    Posts: 134

    savannahDan
    Member

    if you go to melling dot com, you can look up the specs for stock replacement cams.

    Melling # : SYB-25

    Part Description : Camshaft
    Opens : -22 BTC/12 BBC
    Closes : 26 ABC/-8 ATC
    Duration : 184/189
    Opens : 22 BTC/45 BBC
    Closes : 70 ABC/40 ATC
    Duration : 272/265
    CamLift : .230/.238
    Gross Valve Lift : .368/.380
    Center Line C/L : 114/104
    Rocker Arm Ratio : 1.6/1.6
    Valve Lash Clearance : HYD/HYD

    It also lists other cars and years that used the same cam, it was used from 65-76 for all the normal 302's.
     
  10. Relic Stew
    Joined: Apr 17, 2005
    Posts: 1,127

    Relic Stew
    Member
    from Wisconsin

    This was in Pat Ganahl's Ford Performance book.

    It only goes to '72 as that was the year it was published. They changed the slot on the chain sprocket to retard the timing 4° in '72, but the cam didn't change.

    [​IMG]
     
    Last edited: Jan 19, 2012
  11. Dapostman
    Joined: Apr 24, 2011
    Posts: 294

    Dapostman
    Member

    74 302
    intake opens 16/20
    intake closes 70
    duration 266/270
    intake lobe lift .2303
    rocker ratio 1.6/1
    valve lift zero lash .368
    exhaust opens 44
    exhaust closes 20/24
    exhaust duration 244/248
    overlap 36/44
    exhaust lobe lift .2375
    valve lift zero lash .380
    auto/ manual

    per Petersen's
     
  12. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    Thanks, Guys! So if I put a Comp Cams Magnum double roller timing set on there I would be able to advance the cam back the 4 degrees that were lost to the smog era.
     
  13. George
    Joined: Jan 1, 2005
    Posts: 7,287

    George
    Member

    Umm, lame is the answer that comes out!:p

    I was thinking that I've seen pics of the slot in the timing gear being moved instead of in the cam itself, so that it would be straight up or advanced depending on if you sat the new gear adv or on o.
     
  14. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    LOVE this resource! Thanks for the tip.

    However... the numbers are different from the scanned page in the post above. :\
     
  15. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    So I searched the part number C3AZ-6250-V and I get pages with differing "official" specifications. :confused:

    I'm pretty sure that is my part number because my cam is stamped "UA".
     
  16. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    So if I go with Pat Ganahl's numbers (most likely correct), then is it possible for me to discern the Intake Centerline and Lobe Separation Angle from these numbers?

    I come up with a Centerline of 117 and LSA of 141.

    <style type="text/css">p { margin-bottom: 0.08in; }</style> Camshaft &#8211; (part C3AZ-6250-V)

      • Intake Duration &#8211; 266
      • Intake Opens/Closes &#8211; 16 BTC / 70 ABC
      • Exhaust Duration &#8211; 244
      • Exhaust Opens/Closes &#8211; 44 BBC / 20 ATC
     
    Last edited: Jan 21, 2012
  17. Dapostman
    Joined: Apr 24, 2011
    Posts: 294

    Dapostman
    Member

    I get an LSA of 109.5.
     
  18. Untame
    Joined: Jan 5, 2011
    Posts: 214

    Untame
    Member

    Thanks -- I knew that 141 seemed outrageous.
     
  19. 6narow
    Joined: Jun 1, 2008
    Posts: 517

    6narow
    Member

    Apologies if resurrecting an old thread angers anyone, I just ran the lift specs, with an extra .010 added to the lobes and it gives a significant change in lift (.368/.380 becomes .384/.397).
    I wonder how much that would change the duration @ .050?
     
  20. George
    Joined: Jan 1, 2005
    Posts: 7,287

    George
    Member

    302 didn't start until '68, so it was for the 289. would run "smaller" in a 302 than in a 289.
     
  21. 6narow
    Joined: Jun 1, 2008
    Posts: 517

    6narow
    Member

    I bet, seat-of-the-pants, you'd probably be hard pressed to tell the difference between a 289 and a 302, with both engines being in the same condition and state of tune.
     
  22. dumprat
    Joined: Dec 27, 2006
    Posts: 2,809

    dumprat
    Member
    from b.c.

    I have a spec book for ford engines from53-70. It lists all the high performance specs.
     

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