Trimming 4L80e bellhousing for header clearance - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 18th, 16, 06:52 PM Thread Starter
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Anne
 
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Trimming 4L80e bellhousing for header clearance

Came across this today so i thought I'd mention it.

The Hooker mid-length headers have a problem clearing the 4L80e bellhousing.

Here is the installation note :
3.) Installation with a 4L80/4L85 automatic transmission will require trimming to the transmission case bellhousing; installation with older generation GM automatics (TH350, TH400 etc.) may also require trimming to the transmission case bellhousing

I bet there are many other headers that have this problem since these are not big tube (1-3/4").

Here is the LS swap that mentioned how to fix this problem :
How to Swap in a Carb-Equipped LS Engine - Super Chevy Magazine

There are pics that show where to trim the bellhousing. I have attached them.

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Last edited by Lawrence454; Aug 21st, 16 at 12:01 PM.
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post #2 of 6 (permalink) Old Aug 20th, 16, 04:48 AM
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Re: Trimming 4L80e bellhousing for header clearance

That article is almost 3 years old. Holley uses the clam shell mounts now (Anchor part# 2292). I haven't seen recent mods needed (if any) to the bellhousing to fit a 4L80.

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post #3 of 6 (permalink) Old Aug 20th, 16, 07:55 AM
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Re: Trimming 4L80e bellhousing for header clearance

I've done that a few times with 400th and th350 trannys, using "one size fits all" cheap headers and SBC

Not a stress point

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post #4 of 6 (permalink) Old Aug 20th, 16, 09:12 PM Thread Starter
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Re: Trimming 4L80e bellhousing for header clearance

.

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post #5 of 6 (permalink) Old Aug 20th, 16, 09:22 PM Thread Starter
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Re: Trimming 4L80e bellhousing for header clearance

Quote:
Originally Posted by DT View Post
That article is almost 3 years old. Holley uses the clam shell mounts now (Anchor part# 2292). I haven't seen recent mods needed (if any) to the bellhousing to fit a 4L80.
The article might be 3 years old, but the sales brochure for the headers is for today.

https://www.holley.com/products/ls_p...arts/2473-1HKR

And the notes clearly say:
3.) Installation with a 4L80/4L85 automatic transmission will require trimming to the transmission case bellhousing; installation will older generation GM automatics (TH350, TH400 etc.) may also require trimming to the transmission case bellhousing

Is everyone SURE a 4L80e won't have interference ?

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post #6 of 6 (permalink) Old Aug 21st, 16, 05:54 AM
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Re: Trimming 4L80e bellhousing for header clearance

Anne, I would call Holley Tech and confirm.

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