Bbc Holley 300-42 intake manifold height??

Discussion in 'High Performance Modifications' started by 450bench, Jul 14, 2019 at 10:45 AM.

  1. 450bench

    450bench Veteran Member

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    Anybody know the pad height on this intake? Trying to shoehorn a dual plane under a 79 z28 hood. I did cut a hole under the teardrop scoop so that gives me another inch or so under the wing nut area. May try a new weiand street warrior.
     
  2. 1980RS

    1980RS Veteran Member

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    I think the street warrior will fit under your hood, it sits pretty low on my car. I thought Holley stopped making that intake?
     
  3. 450bench

    450bench Veteran Member

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    They did. Saw one on eBay.

    How do you like the street warrior?
     
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  4. 1980RS

    1980RS Veteran Member

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    I have not run it at the track but it sure is responsive even more than the Air Gap I had on it last year. I bought it because it's for peanut port heads and that's what I have on the car. I did port the plenum area a little and get rid of the extra high spots that need some attention. Air Gap went 11.83 so we will see what this intake goes.
     
  5. 450bench

    450bench Veteran Member

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    I ordered the 8123 Weiand so that should be cool. 4.25 front height and 5.42 rear height. Along with the gm drop base I've got it should work.

    I do have a new Gm 6269318 aluminum dual plane intake that measures 4.25 in the front and 5.75 at the rea which may work too. It's a rectangle port intake and I have 290 oval port heads, but I like running that intake with oval port heads. It works great.
     
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  6. 1980RS

    1980RS Veteran Member

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    It works great until you his a certain RPM and then it falls off like a rock. Tried it twice in my lifetime both engines had that result.
     
  7. 450bench

    450bench Veteran Member

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    I've done it many times, once on a bracket/prostreet 70 camaro I had. 11 to 1 427, small solid roller, 4.88, th400, 10 inch converter etc.
    That car ran great on the street and went 10.80s all day. Shifted at around 6200 pulled like an animal.
    Another 454 I had with a mild 268xe hydraulic flat tappet, 10 to 1s, 049 heads, loved the old 163 gm intake. Ran 12.30s and I drove it everywhere.
     
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  8. 1980RS

    1980RS Veteran Member

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    I must have bad luck with them. LOL. I have a wide assortment of oval port intakes so I don't have to resort to the large port on an oval anymore, but I might try the oval on a Sq. port head sometime.
     
  9. 450bench

    450bench Veteran Member

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    Lol, hell, maybe I just didn't rev mine high enough to have issues. And that could really be the case.
    You may need some epoxy for the oval on rectangle experiment.

    Seriously though, have you ever had any luck with an old bbc street dominator?
    I'd like to try one on a mild combo.
     
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  10. 1980RS

    1980RS Veteran Member

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    Personally I have not, but a friend had one when they first came out and it was soggy bottom end compared to his dual plane Performer, about the same performance on the top end.
     

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