C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1985 firewall pic request

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Old Jan 12, 2026 | 09:47 AM
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Default 1985 firewall pic request

Can one of you guys with an early c4 take a pic of the firewall under the relays shown. I have a 3/4" hole in my firewall there.
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Old Jan 12, 2026 | 07:36 PM
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Pic of hole
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Old Jan 12, 2026 | 09:31 PM
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Could it be a knock out for clutch master or a previous owner after market radio amp power supply hole. Never mind wrong side of booster?

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Old Jan 14, 2026 | 07:27 AM
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Looks like a pass through for wiring. This is my 85 automatic.





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Old Jan 14, 2026 | 09:24 AM
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Hard to believe its for wiring without a grommet. And it also lines up with the accelerator pedal.
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Old Jan 14, 2026 | 10:16 AM
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Originally Posted by johnfin
Hard to believe its for wiring without a grommet. And it also lines up with the accelerator pedal.
Well, have you mounted accelerator cable, pedal and confirmed operation? It's in the snapshots supplied to you! You didn't bother with a thanks or even a 'like' for the effort the poster went through for you. You immediately wanted to dispute his comment.

**** poor attitude for someone looking for help I'd say.

Answer is in the snapshots supplied! Grow up and say 'THANKS'



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Old Jan 14, 2026 | 03:05 PM
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Originally Posted by johnfin
And it also lines up with the accelerator pedal.
It does not "line up with the accelerator pedal". You can clearly see the throttle cable 4" outboard, behind the brake booster. You can also clearly see in @bartenderfloyd 's pics that there is no hole in that location on his car. The hole has been added.

WVZR: I looked. He has "liked" ONE (!) post back in 2018 in a C5 thread. ONE! He has initiated 450 threads in the C4 room since about 2021. I've gone out to my 85 and taken pics for him on a few occasions. Sometimes he says thank-you, but if he responds at all it is usually being critical of the respondent. Most of the time he never acknowledges the response at all. I've noticed that his threads don't get many replies any longer. Bartenderfloyd probably won't bother again either. I did give bartenderfloyd a 'like' for his effort, because I learned something from his pics regarding the sealant on the acell cable penetration. I've never noticed that.
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Old Jan 19, 2026 | 11:48 AM
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Default 85 Firewall pic

Originally Posted by johnfin
Can one of you guys with an early c4 take a pic of the firewall under the relays shown. I have a 3/4" hole in my firewall there.
Photo 1
Photo 1
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Old Jan 19, 2026 | 11:58 AM
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Originally Posted by johnfin
Can one of you guys with an early c4 take a pic of the firewall under the relays shown. I have a 3/4" hole in my firewall there.
Photo 1
Photo 1
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Old Jan 20, 2026 | 02:36 PM
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I looked back at pictures from when I refinished my 1986 firewall, no hole in that location. Someone must have drilled a hole to run a wire.
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