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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2008 Posts: 54 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2008 Posts: 54 | I thought I was almost ready to fire up the 261 I installed in my '51 Chevy 3/4 ton, but have run into a temperature sender issue. The capillary style temperature sender in the truck has a 3/8" pipe thread fitting on the end of the tube which fits into a 3/8" female hole on the old 235 head. The female inlet on the head has a land at the bottom for the flange on the tube to seat against. The 3/8" MPT threaded fitting is not water tight. The 261 has an 848 235 head that has a 1/2" FPT inlet. Using a 1/2" to 3/8" bushing won't work because of the design of the capillary tube end fitting. Is the a special adapter made for this conversion? It would have to be a 1/2" to 3/8" bushing with the stepped land at the bottom for the tube flange to seat against. | | |
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