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75mm MAF to 92/92 Fast

This is a discussion on 75mm MAF to 92/92 Fast within the External Engine forums, part of the LSx Technical Help Section category; Tomorrow I am installing my FAST 92/92. The problem I have is connecting a stock size 75mm MAF to a ...

  1. #1
    Junior Member Kamarobuddy's Avatar
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    Question 75mm MAF to 92/92 Fast

    Tomorrow I am installing my FAST 92/92. The problem I have is connecting a stock size 75mm MAF to a giant 92mm Throttle body!!! what can I use to fit that mis matched 75mm maf to 92mm Throttle body?

    I know what you thinking...buy a 92MM LID and larger MAF and solve my problem. Well hollidays are here and money is tight so I am currently going with the stock size LID and MAF.

    what the heck can I buy to connect the stock size MAF to a FAST 92/92?

    P.S. Will a Smooth bellow connect to a stock size maf and to a Fast 92 Throttle body or do I need a larger MAF for the smooth bellow and not as large Throttle body? AHHHH please help!

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    Veteran Hi-Po's Avatar
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    Have you tried using what you have now? Smooth bellows will work also. Soak it in hot water to expand it before attempting to install. I have my stock bellows streched on my 92mm FAST. it did take a lot of persuasion though.
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    Junior Member Kamarobuddy's Avatar
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    well what I have right now is a K&N FIPK cold air to a stock size grenetelli MAF to stock throttle body. I didnt figure that hard plastic would budge from 75mm stock to fit my Fast 92/92.... but I do still have the stock lid laying around if any of that stuff will work

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    Junior Member tdevil55's Avatar
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    I got a silicone coupler like this off ebay.



    Here is one that mite fit, but I dont know your mesurments that you need, so this is a 5" to 4" reducer.

    http://cgi.ebay.com/ebaymotors/5-0-t...Q5fAccessories
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    Junior Member Kamarobuddy's Avatar
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    well if I go with that do I need to measure the inside diametor or outside diamoter?

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    Junior Member Kamarobuddy's Avatar
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    sorry I cant spell for shit...

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    Senior Member tatertot91's Avatar
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    Quote Originally Posted by Kamarobuddy View Post
    well if I go with that do I need to measure the inside diametor or outside diamoter?
    outter diameter

  8. #8
    The stock bellows will fit over the 92mm throttle body. Put it in a pot of hot water first - makes install easier.

  9. #9
    Junior Member Kamarobuddy's Avatar
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    where can I find a cheap 85mm or 100mm throttle body?

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    Senior Member tatertot91's Avatar
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    Quote Originally Posted by Kamarobuddy View Post
    where can I find a cheap 85mm or 100mm throttle body?
    Those are two completely different sizes
    If you need to find something just check ebay
    And also check fbody, ls1 sites
    Most have classified sections

  11. #11
    Quote Originally Posted by Kamarobuddy View Post
    where can I find a cheap 85mm or 100mm throttle body?
    85mm throttle bodies are a 3 bolt design and cannot be used on the 4 bolt FAST 92mm intake.

    Forget about the 100mm throttle body.

  12. #12
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Marc 85Z28 View Post
    The stock bellows will fit over the 92mm throttle body. Put it in a pot of hot water first - makes install easier.
    This^ Like said, you dont have to buy new. I have removed and installed my stock bellows on my 92mm PTM TB many times.

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