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How to tell the difference between fast 78mm, 90mm, and 92mm intake manifolds?

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Old 08-30-2011, 05:07 PM
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Default How to tell the difference between fast 78mm, 90mm, and 92mm intake manifolds?
Like the title says. What differences are there in the appearence of the manifolds to tell them apart?
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Old 08-30-2011, 05:12 PM
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the throttle body opening
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Old 08-30-2011, 05:17 PM
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Originally Posted by TheSilverOne
the throttle body opening
What will the difference be?
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Old 08-30-2011, 06:06 PM
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Size!!!
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Old 08-30-2011, 06:11 PM
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Originally Posted by cookba
Size!!!
Yes, but if im looking at a picture on the internet how am I saposed to tell???
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Old 08-30-2011, 06:59 PM
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tell seller you need a pic with a metric scale across the opening.
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Old 08-30-2011, 07:27 PM
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The fast 78 uses the stock style 3 bolt throttle body. The 90 and 92 use the 4 bolt throttle body. And the 92 will say 92mm beside the lettering FAST on the top of the manifold.
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Old 08-30-2011, 07:35 PM
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Originally Posted by 93ls1
The fast 78 uses the stock style 3 bolt throttle body. The 90 and 92 use the 4 bolt throttle body. And the 92 will say 92mm beside the lettering FAST on the top of the manifold.
Thanks man that's the info I was looking for.
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Old 08-30-2011, 07:50 PM
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So can anybody tell if this is an 90 or 92 intake manifold?

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Old 08-30-2011, 08:05 PM
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no, can't really tell anything from that pic
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Old 09-05-2011, 10:01 AM
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well like stated above. the 92mm will say 92mm next to the FAST emblem. SOOOO
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Old 09-05-2011, 10:09 AM
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Use a ruler. The itty bitty marks between CM's are MM's
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Old 09-05-2011, 10:09 AM
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Originally Posted by cookba
well like stated above. the 92mm will say 92mm next to the FAST emblem. SOOOO
So you would not be able to tell from that particular picture because the 92mm designation follows the FAST emblem.
Attached Thumbnails How to tell the difference between fast 78mm, 90mm, and 92mm intake manifolds?-images.jpg  
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Old 09-05-2011, 03:31 PM
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Originally Posted by supersick99z
Use a ruler. The itty bitty marks between CM's are MM's
Reading is your friend

Originally Posted by z99ls1
Yes, but if im looking at a picture on the internet how am I saposed to tell???
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Old 11-03-2011, 07:30 PM
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ebay?i actually bought that!lmao....he stated it to be a 78mm,but it needs a 4bolt tb,which i didnt have so it for sure is a 90mm the guy who tuned the car confirmed it by measuring it.....small world..lol
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