I am thinking of making new head studs for my vintage side valve Jeep engine, using 4140 stock . The standard size is 7/16" with UNC threads at the block end and UNF threads at the other end . I bought some new studs from a Jeep dealer but they are a loose fit in the UNC block female threads. I measured the original studs I removed from the block , these are a nice firm fit in the block , and these are slightly larger in OD than the new replacement studs

All of the advice I have read suggests that modern stud threads are rolled rather than cut and DO NOT use cut stud threads that are for use in a engine block . The Jeep engine is a low compression vintage engine. I previously have made new 4140 head studs for a Vintage Lister diesel engine. 3/4" diam. long studs. No problems so far.

BTW the Jeep engine originally used bolts rather than studs in all but three of the head fixing locations. Later on, the factory changed over to all studs which is what most restorers do. Any ideas ? Thanks
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