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Thread: 496 what size of heads?

  1. #1
    Junior Member APPRENTICE
    Join Date
    Oct 2004
    Posts
    19

    496 what size of heads?

    We are buiding a 496. I've been told that you can put to big of heads on it. Right now I do have a set of 781's that we can clean up and smooth out but I do not want to put them on and then wish I would have gone with a better head for better performance. Bottom line is this. This engine will go on a dragster. I have very good components in the engine so it can handle some HP. What would I see in performance and HP gains with the stock heads and some aftermarket heads? With basic work on the stock heads can a person get 700HP? What kind of HP could I get with the bigger heads and how big would I want to go? Any advice is greatly appreciated. Of course it is easy to say to buy some wxpensive Rrodies but keep in mind a blue collar budget...thx M

  2. #2
    Senior Member MASTER BUILDER
    Join Date
    Dec 2005
    Location
    berea,ky
    Posts
    184
    The oval port heads are too small for max power on a 496.You need a square port head for that engine.If you are going to use aftermarket heads,something around 325cc's would be a good choice to use.345cc heads will probably be fine in a dragster but i would stay with the 325's.If you wanted CNC'd heads you could go with the 335cc's.

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2003
    Location
    Coldwater, MI
    Posts
    2,998
    In a dragster you can get away with a lot of head. Example I put dart 355 cnc'd on a 468 it ran 5.0s/8.0s @ 2000lbs, example 2 496 dart 360s 1950lbs 4.9s/7.8s
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  4. #4
    Member MASTER JOURNEYMAN
    Join Date
    Dec 2007
    Location
    Grand Prairie, Texas
    Posts
    36
    What are your goals? You can make 700HP with a ported set of oval 781's with big valves on pump gas and a nice solid roller.

    If your just looking for 700HP you dont need a huge head by any means... Im making 675HP on a pump gas hyd roller 496ci with AFR 305 CNC heads. If I were to drop an equivelant solid roller in I would be over 700HP per Tony Mamo of AFR. I drive my car everyday though and dont need or want a Solid.

    Unless your running alot of compression stick with a 270-305cc head (depending on goals and use of engine).

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003
    Location
    Fountain,MICHIGAN
    Posts
    856

    496

    Well I have a 14.6.1 496 748/775 C/Cams Roller,made 870HP w/a 1150 Alcohol Carb,its getting a Enderle B&Ugly on a T/Ram as we Speak.This is on a Edelbrock Victor TR-2(MAYBE a Profiler)?
    Anyway,It has a sey Of DART 355 CNC Heads,I was Told that It would be a TURD!
    Well the #'s Speak LOUDLY.............!
    Later
    G 8)
    O'Ya,I'm Looking for 900-915 w/the Hat and poss.the Profiler?

  6. Racing Junk


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