Weiand 8150 vs 8501

Discussion in 'Engine Topic' started by Vicious, Apr 15, 2019.

  1. Vicious

    Vicious New Member

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    I contacted Holley, asking about what replaced the old 300-36. They weren't aware of a direct replacement, but suggested that the 8501 may be close.

    I then asked what the differences are between the 8150 and the 8501. The tech rep told me that the 8150 has an exhaust port cross over (increasing heat), which helps fuel atomize better for improved street drivability,

    8150.png
    8150

    and the 8501 has an air gap to reduce heat.

    8501WND.png
    8501

    Other than that, he said they are identical.
     
  2. Vicious

    Vicious New Member

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    I'm not sure I agree with the Tech Rep that the 8501 is closer to the 300-36 than the 8150. Looking at pictures of old 300-36 intakes, it appears that they had the exhaust port cross overs, and were NOT air gapped.
     
  3. 1980RS

    1980RS Veteran Member

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    Got a new 300-36 in the box, $250 + shipping if you want it. I have to spend in on another new BB intake I need.
     
  4. Vicious

    Vicious New Member

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    If you'd cover the shipping to Maryland (20634), I'd be interested.
     
  5. 1980RS

    1980RS Veteran Member

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    Wish I could but that will cost me over $50 just from the USPS from where I live.
     
  6. jeff swisher

    jeff swisher Veteran Member

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    Some old reading on the subject.
    http://nastyz28.com/threads/300-36-intake-compared-to-rpm-air-gap.282361/
    And i will say this: If you can't tune to the last hundreth of a second then a manifold swap may not get you what you wish for.
    You need to really put the tune on things as we know.

    I have never ran the 300-36 but went in the 11's with the old Performer RPM intake in stock form.
    And have went into the 12's with an iron Q jet intake and Q jet carb.
    This was my 78 Nova.
    The Strip dominator on that car was no quicker anywhere than the RPM intake.
    But for all out I swapped on an Edeelbrock TR1YX Tunnel-ram that was 12" tall and that made all the difference.
    2 600 CFM 4 barrels.
    I stuck that on a chassis dyno and it was worth a minimum of 53 HP everywhere.

    That is for guys without hoods or that like holes in the hood.
    :)
     
  7. Peck

    Peck Veteran Member

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    Out of curiousity what is your take on the old Weiand Stealth sbc manifold?
    It’s currently on my motor so I can’t readily grab the model number off the bottom at the moment.
     
  8. jeff swisher

    jeff swisher Veteran Member

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  9. G72Zed

    G72Zed Veteran Member

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    I had and used both styles, 1969 or 70 Z/28 at first and a 300-36, now use the 8501. The big difference was on the opposite side of the red circle, pass high side plenum area and not the heat riser portion.

    Sold the 69 Z intake back in the early 90's for the "NEW" and improved designs, I went 11.1 @ 119.4 with a 3600# 71 Camaro with 327 and camel hump 1.94 with a 150 shot. Car never went that quick again. I regret selling that intake. If you find a good 300-36, jump on it.

    I should have poured them to get the cc volume, that would shed some light I would think
     
    Last edited: Apr 17, 2019 at 11:01 PM

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