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Thread: SBC 4/7 swap headers

  1. #1

    SBC 4/7 swap headers

    What header designand size would be best for a SBC 421?

    10.5 Compression AFR 235 heads,Demon 1050 carb, Edelbrock Fully Ported Super Victor, 675/645 278/[email protected] 106ICL 110 lobe sep. 4/7 firing order swap.
    Need headers for drag use.

  2. #2
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    What's it going in ?
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  3. #3
    Senior Member RACING JUNKIE
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    2" to 2 1/8" step headers with 4" collector, nothing smaller than 2" for sure.

    JMO

    Zip.

  4. #4
    Going into a 78 C10 Blazer.
    No fenderwells. Build headers first then put fenderwells
    back or actually cut them to fit.

  5. #5
    Senior Member MASTER BUILDER
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    Re: SBC 4/7 swap headers

    Quote Originally Posted by bubbaf100
    What header designand size would be best for a SBC 421?

    10.5 Compression AFR 235 heads,Demon 1050 carb, Edelbrock Fully Ported Super Victor, 675/645 278/[email protected] 106ICL 110 lobe sep. 4/7 firing order swap.
    Need headers for drag use.
    Are your heads spread port exhaust?
    Competition Engines & Hardcore Engine Parts
    www.cnc-motorsports.com
    [email protected]

  6. #6
    Yes it is a speadport exhaust.

  7. #7
    Senior Member MASTER BUILDER
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    Quote Originally Posted by bubbaf100
    Yes it is a speadport exhaust.
    1 7/8 to 2 inch, or just 1 7/8
    You need more compression.

  8. #8
    I'm limited to 91 octane and a dish piston by rules.
    I wish I could have more compression.
    I have to run a 30'mile street test.
    I have that taken care by a dual fan and dual radiator setup.

  9. #9
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    what kind of event are you runnin', Anyway ? :shock: :shock:
    TRUTH is HATE
    to those who
    HATE TRUTH

    God Bless our folks in uniform
    "We the People, have your backs"
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  10. #10
    Ventura County Street Outlaw.
    Up to 440ci displacement.
    Limited to only smallblocks with 23 degree heads(On Chevy's)
    Single Carb only unlimited induction.
    Chevy's 23 degree heads Unlimited Modifications.
    Limited to dish piston and 91 octane pump gas.
    Unlimited transmission and unlimited rear end.
    Unlimited Cooling.
    Unlimited tire.
    No power adders.
    In the future I'll change classes and run 14:1 on Alky.
    Dual 950 RS Demons with Hogan Sheetmetal intake.
    Top it off with a Dual shot Fogger. 150 at the gate and another
    200 shot. I'm crazy I'll still drive it then on the street too.


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