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  • 1 Post By 70chevybb
  • 3 Post By 34_40
  • 2 Post By techinspector1

Thread: 496 with 840 rectangle port heads
          
   
   

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  1. #1
    70chevybb is offline CHR Member Visit my Photo Gallery
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    chillicothe
    Car Year, Make, Model: 1972 SS Nova
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    496 with 840 rectangle port heads

     



    Im building a 496 and cant really afford aluminum heads. I have a good set of 840 casting number rectangle port heads. They need a valve job, probly milled and i would like to put in hard seats and stainless valves. In the mean time i was given another set of rectangle port heads that have brand new stainless valves and have been ported and polished about 30 years ago. One heads was damaged and i do not want to use them. I pulled the vaklve to put in the first set of heads but found out the intake valves are 2.30 intake and stock 1.88 exhaust. I want to make as close to 600 hp and close to 600 ft lbs of torque so the question is should i have th larger intake valves put in the heads? Would there be a significant gain by going to the larger intake valves? Or just buy new 2.19 valves

  2. #2
    70chevybb is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 1972 SS Nova
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    I will be replacing the 396 that i have in my 72 nova
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    Driver50x likes this.

  3. #3
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: '32 Henway
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    A. Street only.
    B. Street and Strip.
    C. Strip only.
    Rear gears.
    Converter stall.
    Intake manifold.
    CFM.
    Static compression ratio.
    Curb weight with you in the car and a half tank of gas.
    Rear tire size.
    .
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  4. #4
    34_40's Avatar
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    Car Year, Make, Model: 34 Ford 3W Coupe Replica
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    Welcome to the club. Nice looking car. Thanks for the pic.

    I think TechInspector is asking some questions.... I haven't priced it out myself but I think there are some new aluminum heads that will be within your reach once you see what repair/ rebuilding / replacing valves and seats costs. Esp. when you're talking Chevy parts.

  5. #5
    70chevybb is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 1972 SS Nova
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    496

     



    Street driven only
    255/60/15 , 28.5 tall
    3.73 gear
    4 speed
    Rpm air gap intake
    950 quick fuel
    Com cams .566 lift in/exh. 112 ls , 110 cl, 242 intake and 248 exhaust duration @.050 its is a marine grind roller cam
    Roller rockers
    10.5 static comp
    Msd ignition
    3500 lbs car

  6. #6
    70chevybb is offline CHR Member Visit my Photo Gallery
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    Nova

     



    UThanks 30_40, Here is the before pic. I bought it feb, 12 2017 and drove it out of the garage feb, 11 2017. Sorry i could not get the pics upright
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    Last edited by 70chevybb; 01-07-2018 at 06:44 PM.

  7. #7
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    Car Year, Make, Model: 34 Ford 3W Coupe Replica
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    You've done a pile of work. It looks great now. Thanks for sharing the pics

  8. #8
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
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    I just saw a pair of these sell to high bid $610. You can't resurrect iron heads for that.
    https://www.ebay.com/itm/Chevy-396-4....c100011.m1850
    .
    glennsexton and 40FordDeluxe like this.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  9. #9
    DennyW is offline CHR Member Visit my Photo Gallery
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    Looking good...
    Last edited by DennyW; 01-08-2018 at 07:40 AM.

  10. #10
    Driver50x's Avatar
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    I had a '69 Nova in High School. I love those cars.
    Steve

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