DFeeney Posted June 5, 2023 Share Posted June 5, 2023 Hello my old car friends, I am looking to purchase a radiator cap for a 1922 Hudson. The attached photo shows the top neck that the cap threads into. I am looking for any cap that would fit. The I.D. of the neck is about 1 7/8". "What have You ?" thanks, Don 740-816-4284 Link to comment Share on other sites More sharing options...
John Kelso Posted June 6, 2023 Share Posted June 6, 2023 Don I've a dog bone cap that measures with mikes about 1. 950 on the outside of the threads. Can send it if you wish PM me if interested. John Link to comment Share on other sites More sharing options...
DFeeney Posted June 6, 2023 Author Share Posted June 6, 2023 Hello John, Thank you for your response. I would guess there were not many different thread sizes for radiator caps. I am building a 1922 Hudson fair grounds racer and plan to use a Hudson Moto Meter on the cap. Could you sends pictures and price on yours. Thanks, Don Feeney Link to comment Share on other sites More sharing options...
John Kelso Posted June 7, 2023 Share Posted June 7, 2023 Don the thread count is 18 TPI, dog bone is 6.5" and the hole is 7/16. Price is $45 plus shipping Link to comment Share on other sites More sharing options...
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