<html><body>Michael- This is a common scene on the early cars. Happened to me, often, as well as others I'm sure. The real "clue" to the issue is as you said: "but after a few turns became tight"..as soon as I get that indicator I get out my Whitworth thread gauge.<div><br></div><div>I'm currently working on a 100 transmission that had its studs "modified"...I guess that's why we have British Tools and Fasteners in Lyons, N.Y. Hopefully not too many mods to your car- studs are $4.50 each, but correct BSF thread. That issue cost me $50 to be able to button up this gearbox to the overdrive. Regards, Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "Michael Salter" <michaelsalter@gmail.com><br>To: healeys@autox.team.net<br>Cc: <br>Sent: Friday June 26 2020 7:55:29AM<br>Subject: [Healeys] 3/8 BSF studs<br><br><div dir="auto">The 100 that I'm restoring has been previously "restored" so I'm being pretty careful with threads and running taps and chasers through any that look even slightly suspicious. <div dir="auto">The exhaust flange studs on a 100 (2K7708) are 3/8" BSF and 3 years back the ones on this engine looked to be in such good shape that I decided that running a chaser down them wasn't necessary. </div><div dir="auto">Silly me!!</div><div dir="auto">With one of the last jobs being installing one of my specially made single sweeping curve front pipes I confidently started running the BSF nuts up to secure the flange. On the last one the nut started well but after a few turns became tight .... as is my usual practice I decided to back it off and run a chaser up the stud to clean up the thread.</div><div dir="auto">Ahhh Houston .... the nut had seized tight on the thread and despite every trick the stud eventually broke off at the top of the thread.</div><div dir="auto">Now this is on an engine that I have painstakingly restored however, there was no option but to remove all the manifolds to replace the stud ... </div><div dir="auto">Only after all that did I discover that this 1 stud had been replaced with a UNF and that was why the brass nut had locked onto it ...</div><div dir="auto">Yeeech!!!!!</div><div dir="auto">How was your day?</div><div dir="auto"><br></div></div>
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