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Mod | | | Forums66 Topics128,089 Posts1,056,004 Members48,430 | | 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: Jan 2011 Posts: 20 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 20 | First off, I'm running a 70's model small block chevy in my 37. I'm wanting to run the stock mechanical temperature guage, but the v8 has a larger diameter electrical sending unit threaded in the left head. Does anybody know how to overcome this problem? I'm sure someone will know how. Thanks | | | | | Joined: Jun 2009 Posts: 2,201 Shop Shark | | Shop Shark Joined: Jun 2009 Posts: 2,201 | You can get a brass adapter at the FLAPS. Can't remember the size, so you might take the old sender and the electric sender to the store for sizing. | | | | | Joined: Jan 2011 Posts: 20 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 20 | One more dumb question. What is the FLAPS? Thanks | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | Friendly Local Auto Parts Store .... or in the case it's Unfriendly, you might also find what you need at a plumbing supply store  galvanized reducers work too Bill | | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | What size is the fitting on the 37sender?
Is it pipe or straight?
What size is the fitting on the engine?
| | | | | Joined: Jan 2011 Posts: 20 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 20 | I'm not sure right off what threads I'm dealing with. When ever this big blizzard blows by I'll try to get back out to the garage and check. | | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | IF, your 37 sender has 5/8 18NF threads (as my 50 ) and IF, your engine thread is 1/2 pipe The you could used napa adapter 701-1798 ...pic... | | | | | Joined: Jan 2011 Posts: 20 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 20 | I still haven't checked my thread size yet but your pic of that temperature prob looks just like mine. I have a couple concerns though that I need cleared up. First off is: The threaded fitting in that picture has 4 flat sides in it to allow the probe and Bourden tube to pass through the back of the guage.What keeps it from leaking around the fitting? Second issue: My Bourden tube does not appear to be long enough to reach the threaded hole in the DS head (I'm trying to keep the smooth firewall appearance) So I'm wondering if I could thread it into my Edelbrock intake manifold between the carb and the distributor? Any help would be appreciated. Thanks | | |
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