DanAR
Senior Member
I’m sure if I guy went through the old threads enough I could find the answer to this but the threads seem voluminous. Cast iron exhaust manifolds have always been subject to warping as long as I can remember. I got an exhaust tic from one in my first car, a 64 Sport Fury in the late 60s. A lot of the time it was due to manifold bolts loosening and backing out - sometimes simply retorquing the bolts would take care of it. If not then, machining the manifold, adding a gasket (most manufacturers did not use them) or some red, high temp RTV solved the issue. But I keep reading about seized and broken bolts when I read threads on the RAM bout warped manifolds. That’s new to me. If a bolt breaks and clamping force is lost on a portion of the manifold I can understand the manifold warping. But why are the bolts breaking. Are they just plain using weak bolts? Over- torquing during assembly? What’s going on here?
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