midman Posted July 1, 2018 Share Posted July 1, 2018 I’m working on reinstalling the engine on my 1931 90 Series and I have a question I know you guys can answer. My original exhaust manifold basically was in pieces when I got it and I have been lucky enough to scrounge up a few spares. My guestion is, knowing the manifold has to move some, are the intake and exhaust manifolds supposed to be exactly the same thickness(the part where the slightly cone shaped washers go)? I am assuming yes but my exhaust manifold was surfaced flat and is now about .71 and intake is .75. Should I have the intake surfaced to match or do you think I am safe? Link to comment Share on other sites More sharing options...
Bob Engle Posted July 1, 2018 Share Posted July 1, 2018 My first thougtht was that .040" would be an acceptable difference, but knowing the problem with cracked exhaust manifolds. I would opt to get them the same thikness. You could take the metal off the washer side as this will give you a nice smooth surface for movement. Most of these manifolds show a groove from the washer and his could prevent the washer from grabbing rather than sliding. Bob Engle 1 Link to comment Share on other sites More sharing options...
midman Posted July 4, 2018 Author Share Posted July 4, 2018 Bob, Thanks for the thoughts. I am going to try your suggestion. Much appreciated. Chuck Link to comment Share on other sites More sharing options...
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