61-63, I took the worst stud out and it was clear. However, the tube directly under the stud was clogged with gummed up oil. 63 used hollow push rods. The stud holes just oil the stud ball and rocker/valve stem area. I may just remove all the studs and clean the chamber. I have yet to be able to find replacement, hollow studs thats why I thought about removing the chamber plug and cleaning it out. But the plug looks odd and not sure I'd be able to find a new plug for it. Thanks for your input. I'd rather not install solid suds just yet..
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