Crazyfamily Posted October 30, 2019 Share Posted October 30, 2019 I don’t seem to have any luck in the want to buy section so thought I’d post here too.... I am looking for a radiator cap for my ‘27 Buick, it can be nickel, it can be chrome, it can be brass (I prefer brass actually)! it can be drilled for a Motometer or not, I will be drilling it if isn’t already drilled. If anyone has a radiator cap or knows of one please let me know. I want a plain cap as I will be installing the brass wings on it and a Motometer. thanks in advance.... william Link to comment Share on other sites More sharing options...
27donb Posted November 16, 2019 Share Posted November 16, 2019 Best bet is keep checking Ebay, the pop up from time to time there. 1 Link to comment Share on other sites More sharing options...
hidden_hunter Posted November 17, 2019 Share Posted November 17, 2019 19 hours ago, 27donb said: Best bet is keep checking Ebay, the pop up from time to time there. I've bought more than my fair share of caps from ebay that haven't been measured properly 😐 2 Link to comment Share on other sites More sharing options...
Morgan Wright Posted November 17, 2019 Share Posted November 17, 2019 https://www.snydersantiqueauto.com/SearchByKeyword?word=radiator cap 1 Link to comment Share on other sites More sharing options...
Crazyfamily Posted November 17, 2019 Author Share Posted November 17, 2019 2 hours ago, Morgan Wright said: https://www.snydersantiqueauto.com/SearchByKeyword?word=radiator cap Not sure that they fit the Buick radiator neck? Link to comment Share on other sites More sharing options...
Guest Posted November 17, 2019 Share Posted November 17, 2019 What are the thread dimensions? I have some almost flat, female thread caps that are unidentified. Link to comment Share on other sites More sharing options...
Crazyfamily Posted November 17, 2019 Author Share Posted November 17, 2019 39 minutes ago, Tinindian said: What are the thread dimensions? I have some almost flat, female thread caps that are unidentified. Not sure of the threads but they are course. I can measure the neck dimensions if that would help? Link to comment Share on other sites More sharing options...
Guest Posted November 17, 2019 Share Posted November 17, 2019 When they are male (external threads) it should be easy to count them and of course I NEED the diameter. If I am going out in the garage to look for a cap I need TPI (threadsper inch) and diameter. You need/want a cap, I need the information. Link to comment Share on other sites More sharing options...
Crazyfamily Posted November 17, 2019 Author Share Posted November 17, 2019 25 minutes ago, Tinindian said: When they are male (external threads) it should be easy to count them and of course I NEED the diameter. If I am going out in the garage to look for a cap I need TPI (threadsper inch) and diameter. You need/want a cap, I need the information. Ok I’ll run up to the car this evening and get the info, I appreciate it very much! william Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 17, 2019 Share Posted November 17, 2019 (edited) Buick radiator top nozzles are 16 threads per inch. The radiator caps come in 2 sizes earlier + 1921-22-23 4 & 6 cyl, 1925 Std These are 2.02" across in the cap 1924 6 cyl, 1925 Master, 1926-27-28 6 cyl These are 2.312" across inside the cap. These are a little hard to measure if the motometer base is sticking thru, but you should be able to measure it with a dial or digital micrometer. There are some new US made 2" dogbone radiator caps, but they are the wrong thread pitch. Hugh Edited November 18, 2019 by Hubert_25-25 (see edit history) 1 Link to comment Share on other sites More sharing options...
27donb Posted November 18, 2019 Share Posted November 18, 2019 3 hours ago, Hubert_25-25 said: Buick radiator top nozzles are 16 threads per inch. The radiator caps come in 2 sizes earlier + 1921-22-23 4 & 6 cyl, 1925 Std These are 2.02" across in the cap 1924 6 cyl, 1925 Master, 1926-27-28 6 cyl These are 2.312" across inside the cap. These are a little hard to measure if the motometer base is sticking thru, but you should be able to measure it with a dial or digital micrometer. The new caps that are available are the wrong thread pitch. Hugh What about the reproductions from here? http://www.vintageandclassicreproductions.com/buick.htm 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 18, 2019 Share Posted November 18, 2019 Don, These are likely correct. Vintage and Classic Reproductions have nice stuff and do nice work. I have been seeing another person selling dogbone caps in the US that are not correct for Buick. Wrong thread pitch. Let me restate what I wrote above. Hugh 1 Link to comment Share on other sites More sharing options...
Guest Posted November 18, 2019 Share Posted November 18, 2019 Don. sorry none of my caps would fit, I just went out and checked them. Hugh, thanks for the measurements. I will add them to my database. Link to comment Share on other sites More sharing options...
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