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Thread: 18 Degree Intake vs 23 Degree

  1. #1
    Senior Member MASTER BUILDER
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    18 Degree Intake vs 23 Degree

    I'm rebuilding my sbc race engine from the ground up. I will be replacing the heads, intake, valve train, etc. Would going to a 18degree top end make sense? I'm shooting for 700hp.

  2. #2
    Senior Member DYNO OPERATOR
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    With the right components you can get 700hp from a 23 deg motor.

    TS1955

  3. #3
    Senior Member RACING JUNKIE curtisreed's Avatar
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    But not as easy as from a 18 motor. We have a 406 that made 705hp with 23 heads and it has had quite a bit of port work on the heads and intake, 15-1 compression on alcohol, with a pretty aggressive cam.

    Curtis

  4. #4
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    If the dollars are basically the same to buy a new top end, I would think the 18degree is the way to go.

  5. #5
    Senior Member SENIOR BUILDER
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    If you are already planning on spending the money, might want to consider a 15 degree setup.

  6. #6
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    Don't the 12,15 and 18 degree heads use the same intake and exhaust.

  7. #7
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    Quote Originally Posted by jreiley
    Don't the 12,15 and 18 degree heads use the same intake and exhaust.
    12, 15 and 18 degree take the same intake
    700 HP is easy with either 23 degree or 18 degree
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  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by cncmotorsports
    Quote Originally Posted by jreiley
    Don't the 12,15 and 18 degree heads use the same intake and exhaust.
    12, 15 and 18 degree take the same intake
    700 HP is easy with either 23 degree or 18 degree
    I respectfully disagree, it's not easy to make 700 HP with 23* heads without spending a ton of money. (why don't you tell us how much you get for a 23* head motor making 700 HP guarenteed/dyno'ed. without additaves/nitrous) Exceptionly/good 23* heads flow maybe 340 CFM. Good 18* heads flow 400 CFM plus, with a 434" it's possible to make 800HP plus with 18* heads for less than $10,000.00 without additaves,
    Carb to pan.

    JMO

    Zip.

  9. #9
    Senior Member RACING JUNKIE curtisreed's Avatar
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    Quote Originally Posted by cncmotorsports
    Quote Originally Posted by jreiley
    Don't the 12,15 and 18 degree heads use the same intake and exhaust.
    12, 15 and 18 degree take the same intake
    700 HP is easy with either 23 degree or 18 degree
    I'm with Zip on this. 700hp with 23 heads is not "easy". If it were that easy for you guys I would be seeing a lot of CNCmotorsports sbc motors out there, because you guys could sell them cheap, and hearing a lot of buzz about them. Or at the very least you would be selling quite a few of those 23 heads you are using to do it. Not saying it can't be done just saying it ain't easy.

    Curtis

  10. #10
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    Pretty much decided to go the 15/18 route. Not being totally sure what I need to look for other than heads and intake, what else special do I need to look for?


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