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proper silicone diameter to fit over OEM 90mm DBW throttle body?

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Old 04-18-2012, 10:53 AM   #1
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Default proper silicone diameter to fit over OEM 90mm DBW throttle body?

I did some searching, lot of rif raf. If I have a stock 90mm DBW throttle body, what size of silicone adapter do I need? Seems like 4.25" is the answer, but some say a heated/slitted 4".

Firm answer would be appreciated.
TJ
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Old 04-18-2012, 01:06 PM   #2
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Woops.. should be in external engine forum. Maybe a mod can move this thread
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Old 04-18-2012, 09:16 PM   #3
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For what it is worth the GM seal/gasket is part number 12576549 and is Felpro number 61436.
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Old 04-18-2012, 11:02 PM   #4
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No. I mean a silicone hose/elbow that would mate your air inlet duct to the throttle body. Not the tb to intake o-ring.
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Old 04-19-2012, 06:19 AM   #5
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Quote:
Originally Posted by NOS327 View Post
No. I mean a silicone hose/elbow that would mate your air inlet duct to the throttle body. Not the tb to intake o-ring.
Sorry, my bad - I saw the word silicone and was thinking silicone seal. In any event the answer is 4.0 inches. I am running a 90mm LS2 DRW and it measures 3.960 at the inlet, which includes a slight lip. (This is the same as my stock LS6 DBW 78mm throttle body which allowed me to use the same inlet air tube when I upgraded.)
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Old 04-19-2012, 05:23 PM   #6
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Awesome, thanks!
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Old 04-19-2012, 05:23 PM
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