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Mod | | | Forums66 Topics128,022 Posts1,055,377 Members48,422 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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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. | | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | Yes Joe you can get an adaptor bushing, check with vendors on this site, Chevs of the 40s or Jim Carter etc. This used to be a common item back when we had real auto parts stores. You may try local NAPA store.
good luck | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Jim Carter and most other vendors sell the adapter. NAPA supposedly has them as Balkamp part #701-1542 (the picture on their website looks to be incorrect but the dimensions look right) | | | | | Joined: Mar 2008 Posts: 54 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2008 Posts: 54 | Thanks guys. I'll call NAPA in the morning and if they don't have it I'll order it on line. | | |
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