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OK, I have discovered a crack in my heat riser valve that fits inbetween the exhaust manifold and exhaust pipe. If I remove this and leave it off, will my exhaust fit correctly? Or should I get a new one? (and where can I get one?) If I can leave it off, is there a rig that can make up for the additional space. Thanks again!!!
70 Chevelle 350
 

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To my knowledge, you need to have it there. The mainfold doesn't have the machining for the donut to fit into it. You might try a real parts store (not Kragan or the like) for one. If they don't have it then wrecking yards are in your future
 

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Most of the Restoration supply places sell them. I think Ground Up has them. There is also one that looks and fits correctly but doesn't have the plate in it.
 

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You can leave it out if you take a die grinder and form a seat for the donut. However, you will have to make up the missing space with some exhaust work. Did the same to my 66.

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