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morsim
PostPosted: Sun Jul 12, 2026 11:58 pm 
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3 Deuce Weber

Joined: Thu Jul 31, 2025 2:16 pm
Posts: 57
Car Model: '69 Dart Custom
What could this hole be for? It's been found on a newly installed '74 head. Does not exist in my older '69 head.
When filling my rad, coolant started dispensing out of it and into the lifter galley :o
It's threaded, and I plugged it with a small screw + teflon tape...
Any ideas?

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Dart270
PostPosted: Mon Jul 13, 2026 2:19 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 17583
Location: Blacksburg, VA
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Oh, I'm sorry! I drilled and tapped that hole in about 2004 to mount part of an EFI fuel rail and forgot it was there and that you needed to plug it. At least it was an easy fix.

Lou

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morsim
PostPosted: Mon Jul 13, 2026 9:36 am 
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3 Deuce Weber

Joined: Thu Jul 31, 2025 2:16 pm
Posts: 57
Car Model: '69 Dart Custom
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Oh, I'm sorry! I drilled and tapped that hole in about 2004 to mount part of an EFI fuel rail and forgot it was there and that you needed to plug it. At least it was an easy fix.

Lou
No worries! :D
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Rick Covalt
PostPosted: Mon Jul 13, 2026 1:42 pm 
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Joined: Wed Oct 23, 2002 7:57 pm
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Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
That is a top secret nitrous injection port. Lou is very sneeky!! :D :D

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Reed
PostPosted: Mon Jul 13, 2026 11:43 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 13421
Location: Fircrest, WA
Car Model: 76 D100
Custom bleed valve for purging air out of the cooling system. :wink: 8)
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Dart270
PostPosted: Tue Jul 14, 2026 9:27 am 
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Location: Blacksburg, VA
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Yes, it also is a perfect location for cooling system bleeding, although I've almost never had trouble with that...

Lou

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volaredon
PostPosted: Tue Jul 14, 2026 3:46 pm 
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Supercharged
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Joined: Wed Oct 12, 2005 9:00 pm
Posts: 3239
Location: kankakee IL
Car Model: 80 volare, 78 fury 2 dr, 85 D150
That is a machined boss for something. I've seen various sensors mounted there on newer ones. Mostly ones that originally had lean burn ignition.
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