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Thread: Air Breather Choice

  1. #1
    Join Date
    Oct 2017

    Default Air Breather Choice

    I'm running a 550-409 EFI on my LSx, and I noticed that the base of my breather doesn't fit the carb. Is there a special base I need to purchase? If a photo is needed, let me know. Thanks.

  2. #2


    How does it not fit? Is the diameter too small? Does it hit on the body of the TB? I'm using a cheap drop base that I got off of eBay.

  3. #3
    Join Date
    Oct 2017


    It was not cheap, and it's too small to fit the carb, diameter is the problem. I'll take a photo and you can see. Thanks. The seal that was removed and the thing was still too small.
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  4. #4
    Join Date
    Jan 2010
    Brisbane, Australia


    Looks like many other cheap drop bases on the net. The ID of the flange is probably just on the tight side of minimum. Just open it up a fraction with a ball pein hammer, etc. I expected to see a spun aluminium base like from Stef's etc., like I have on my Holley XP. Gary

  5. #5
    Join Date
    Oct 2017


    I ordered this so I hope it fits.
    Click image for larger version. 

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