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Old 03-29-2020, 02:24 PM   #2
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Join Date: May 2010
Location: Masterton, New Zealand
Posts: 2,754
Default Re: 21 stud temp gauge question

The temp gauge used in these 21 stud engines is the capillary type; has the glass tube with red liquid. Yes, it seats on that tapered shoulder you refer to. The thread is 5/8 UNF. The later 24 stud engines use the electric type temp gauges. These screw into the heads with a 3/8 pipe thread. Will not fit the earlier engines
Unfortunately, two half wits don't make a whole wit!
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