Re: 6 cyl (292) manifold questions/issues
The heat riser closes with a bimetallic spring to retain some exhaust heat for carburetor preheat. It blows at least partly open with exhaust gas flow, though. Once the spring warms up, the valve flap should be all the way open.
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~Steven
'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper
Simi Valley, CA
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