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283 cam recommendation

Discussion in 'The Hokey Ass Message Board' started by edhurl, Sep 9, 2013.

  1. 1971BB427
    Joined: Mar 6, 2010
    Posts: 5,767

    1971BB427
    Member
    from Oregon

    2.02 valves wont work with stock bore, but he's going .060" over, so no problem with clearances.
     
  2. I have a 283 with a set of power pack heads, how can you tell if the seats have been replaced with hardened ones? Also if they in fact do have hardened seats I had thought of replacing the 1.70 intake valves with the 305 1.84, would i need to replace the exhaust valve with the 305 1.60, i believe, also? Would this be an adviseable move or not? Going to run Offenhauser 3x2 intake with 3 holley 94's, 700R4 trans and a 3.73 gear in a nine inch rear. Any cam recommendations?

    Thanks in advance
     
    Last edited: Sep 11, 2013
  3. I'm running a old school Duntov 30/30 with solid lifters.
    Sounds great !
     
  4. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    Anyone have advice on an intake/carb combo that would compliment the comp 268 cam and power packs???
     
  5. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    Been looking for some in my area, they don't seem to exist, lol
     
  6. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    305 Heads would be close, a little more potential than the 520's. Single 4 would be a lot easier to tune. I was figuring 2 390's or similar for your dual, a 650 - 700 single 4 would make about the same.
     
  7. Not familiar with WI but I hit CL with 416 heads in a few different cities.
    Entire 305 HO engine + 416 heads for 150 needs rebuilt.
    Another 305 ho with trans runs
    Another set fresh and ready to go make offer.

    They are out there
     
  8. Fast55097
    Joined: Oct 16, 2007
    Posts: 114

    Fast55097
    Member
    from S.A. TX

    Some 601 heads will yield more compression.
     
  9. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    1.84/1.50 58cc heads, good water pump, rochester quadrajet 4 barrel,intake, and hei dist all off an 84 small block for $150

    All looks very clean

    Sound good?
     
  10. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    Forgot to add it was a high output 305
     
  11. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    Sounds good!
     
  12. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    Also found a set of 601's for $50

    Decisions decisions.....
     
  13. Sounds good !

    You'll need to figure your compression ratio with either.

    Detonation prevention or reduction can be done by removing potential hot spots, and keeping your quench distance tight.
    Busting off the hard edges will decrease hot spots and will increase the CCs of the combustion chambers, the 601s will let you do more of that before you loose compression.

    You can also go lumpier on your cam choice, raise Rpms move power band up and bleed of some cylinder pressure.
     
  14. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    Anyone want some 520 power packs?
     
  15. 1971BB427
    Joined: Mar 6, 2010
    Posts: 5,767

    1971BB427
    Member
    from Oregon

    If you're replacing the valves, you should skip the 1.84's and go to 1.94's. Same price, and better breathing. I'd go to 1.60 on the exhaust too.
     
  16. HEATHEN
    Joined: Nov 22, 2005
    Posts: 7,591

    HEATHEN
    Member
    from SIDNEY, NY

    So long as they're not cracked....305 heads were big on that.
     
  17. Gizzy
    Joined: Jan 20, 2008
    Posts: 682

    Gizzy
    Member
    from N.W,Ohio

    I've got a 283 .030 over,power pak heads(hardened seats),weiand w/600 holley,comp 262.Nice little street motor.
     
  18. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    So, what am I actually gaining from the 601's or 416's compared to the power packs? Is it worth buying them and still having to do the valve job and spring upgrades?
     
  19. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    So I ran across a qaudrajet carb and intake for $70, they any good after a rebuild? I've read both negative and positive...
     
  20. Well you'll have to do springs anyway.
    But you'll get hard exhaust valve seats.
    Bigger valves,
    Bigger runners,
    Better flow,
    Near perfect velocity
    More compression
    More power.
    Also some accessory holes you might not want.
    They learned a lot in those 20 years between manufacturing dates.

    Then secondary you can utilize- if you wish
    A bigger cam, higer revving, higher power band, looser converter, numberically higher gears.

    They are great heads for the smaller bore engines, and cheap too. the 4"+bore engines guys will fall on their face on the top end with them. It's all about flow and velocity. No flow and its out of breath- no velocity and there's no power.
     
  21. HEATHEN
    Joined: Nov 22, 2005
    Posts: 7,591

    HEATHEN
    Member
    from SIDNEY, NY

    Nothing wrong with Quadrajets; a very versatile carburetor. However, they made them for over 30 years and some of them won't do you any good. There should be an I.D. number stamped on the driver side about 2/3 of the way back, vertically, unless it's very early ('65-'67), in which case it will have a round dime sized tag pressed into the driver side of the main body.
     
  22. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    What am I looking to avoid? He has a few of them he said , including one he took off a running impala
     
  23. The latest Electronic versions of the QJet.
     
  24. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    Look for late 70s - 1980, after 80 most will be electronic.
     
  25. Roothawg
    Joined: Mar 14, 2001
    Posts: 20,062

    Roothawg
    Member

    My favorite is the 260h by Comp cams.
     
  26. davedriveschevy
    Joined: Mar 16, 2011
    Posts: 37

    davedriveschevy
    Member

  27. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    Here you go, as ground ICL 99 LSA 105, with 305 heads

    [​IMG]
     
  28. edhurl
    Joined: Sep 9, 2013
    Posts: 51

    edhurl
    Member
    from arena, wi

    Would it change head and cam choice if I bore to 4"? That's only if the machinest says I have enough wall....
     
  29. Yea, quite a bit.
    You'll have a 301 and should follow proven 301 recipes.
     
  30. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    You could go with Patriot 2168 -about 800 assembled ready to run or the ever popular Vortecs. You will need to figure pistons to get the right compression. here is the XE274 with stock vortecs

    Maybe up one notch on cam, starting to get pretty far from the original idea.
     

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