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My El Camino heads and exhaust manifolds are cast iron. The dang bolts get loose by themselves. I hope to never need to take it apart again. My next step is to switch to studs. I hear if I cut a small slot in the threads and then install the threads into the head they will stay forever. Then just nuts to hold the exhaust in place.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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