double hump heads or vortech?

Discussion in 'High Performance Modifications' started by 78camarob, Aug 10, 2011.

  1. 78camarob

    78camarob Veteran Member

    Nov 27, 2010
    mesquite tx
    a friend of mine has core double hump heads that need to be machined and wants 50 for them, or should i get vortecs both would have all the stuff i could do to them, port and polish, shaved all that, with would be better for a 78 camaro original motor slight cam and has original heads with 5 angle valve job
    Last edited by a moderator: Aug 11, 2011
  2. retorq

    retorq Veteran Member

    May 13, 2003
    Kingman, AZ
    Your gonna need a new intake, intake gaskets and plugs at the very least if you are going to Vortecs from a std small block head ... I've been there a couple times.
  3. Bikefixr

    Bikefixr Veteran Member Lifetime Gold Member

    Mar 13, 2006
    Not even a contest. Those old fuelie heads were good...30 years ago! I can guarantee they've already been rebuilt a couple times, so the decks are probabally thin, the valve seats have been cut so they are receded into the head, not to mention cracks. By the time you fix and rebuild them, you could buy Vortec's, have some $ left to get the proper manifold. Have you actually PRICED out all the trick stuff you want done? Decent porting is EASILY $500+. Add in the rebuild, machining, springs/valves/retainers and you can have $1500 in a set of 35 yr old, heavy, castings...and they STILL won't flow as well or as cleanly as a good set of aluminum AFR's.

    Vortecs are THE best bang for the buck around. With a 30 min ghetto grind, they are good to .550 lift. Add in some cheap Z/28 type springs, spend 2 hrs pinning the studs and you are good to go. They will easily support 500HP and last forever. If you have a stock short block, mill the Vortec heads a little to bump the compression to 9.75:1 and vastly improve quench. With the right cam, a Vortec head/Intake manifold will add 100+ HP and run reliably all day long for you. Vortecs need little work. A little backcut on the valves, a quickie blend where the seat meets the bowl will boost the HP by 20. They already outflow every stock GM head made including the famed Bowties and Corvette LT-1 heads. In additon to flow capacity, they have excelent flow quality. They can run more compression than most iron heads without knocking. They do need a special intake, but I see used Eddy's that fit for $75 all the time. The center-bolt valve covers don't leak and the intake gasket is reusable.
  4. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    Mar 25, 1999
    San Jose, CA, USA
    Double Hump heads weren't that good to start with
  5. ChevyD

    ChevyD Veteran Member

    Jun 19, 2009
    Not sure about that, I made 500+ whith them on a 355. Having said that, I would go with the vortecs also. Mind you, if you keep your eyes open, you could probably find a good set of aluminum heads for what you will spend on the vortecs once all the work you want to do is done.
  6. ProStreet383

    ProStreet383 Veteran Member

    May 23, 2007
    I have to agree on all of the above. Double humps ported by somebody that knows HOW to port them are no joke. That being said vortecs are the better option and even better would be a good used set of aluminum heads.
  7. Kamikaze

    Kamikaze Veteran Member Lifetime Gold Member

    It depends on your budget...which is the MAJOR LIMITATION!!!

    As others have stated, Vortecs are the way to go! But will need a new intake and possibly some other items...

    If you are limited in funds and have a decent intake, cam , carb, and the fuellies are in great shape, then they will be an improvement over a stock smogger head...
  8. Led Zep

    Led Zep Veteran Member

    Mar 13, 2008
    Vortecs are light years ahead of the GM fuelie head.
  9. trmnatr

    trmnatr Veteran Member

    Apr 22, 2009
    Depends on how budget you want to be and whats done

    With camel hump 291 heads, we proved they can make ~530hp on a 400 small block, which ran 10.13 to 10.22 at 131-133mph every pass with 1/8 times 6.41-6.60 @104-106mph every run all season long. 2850 pound car
  10. trmnatr

    trmnatr Veteran Member

    Apr 22, 2009

    The exhaust runners are ported just to smooth them out so they could be polished and the bowls were ported due to the valve job for the larger 2.02"/1.6" valves

    The pinch point in these heads are pretty big. We shifted at 6,000rpm and ran past the lights at 6,500rpm to 6,800rpm which was over .15 when we were geared to shift at 6,000rpm and ran 6,200rpm past the lights

    People claim the chambers are so bad they need 38°+ to run, Our fastest ET's are at 34° timing, which tells you they are not as bad as some people believe

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