I am after the thread size and type on the Air injection ports in a 2.8 blue motor head
Need to buy some plugs
Air injection plugs
Started by
UCSLE
, Jul 27 2025 07:45 PM
6 replies to this topic
#1
UCSLE
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Posted 27 July 2025 - 07:45 PM
#2
claysummers
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Posted 27 July 2025 - 08:20 PM
Guessing 3/8UNF but I can have a check in the am
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#3
warrenm
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Posted 27 July 2025 - 10:42 PM
Guessing 3/8UNF but I can have a check in the am
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They are bigger than 3/8", maybe 5/8".
#4
claysummers
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Posted 27 July 2025 - 11:55 PM
I was thinking of the other plugs my head has. Carby black head.
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#5
Dr Terry
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Posted 28 July 2025 - 07:22 AM
Yep, 5/8" UNF grub screws are perfect for the job.
The other plugs in the head would be for water jacket connections. They are all 1/2" NPT.
Dr Terry
#6
UCSLE
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Posted 28 July 2025 - 12:45 PM
Thanks 5/8 UNF it is.
#7
Muzza
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Posted 28 July 2025 - 05:46 PM
5/8 unf, i installed them and maked the location, removed and cut 90% thru with thin cut off, re installed them and snapped them off , then ground level, i also ground the inside of the exhaust port
Edited by Muzza, 28 July 2025 - 05:47 PM.
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