Tim Wolfe Posted May 23, 2023 Share Posted May 23, 2023 Can someone tell me why the early 218.6 engines have two 1/2" holes in the heat riser and the 268" engine produced later, do not have the holes? My early production cars always ran hot enough the carburetors got hot. I tried plugging the holes and the carburetor now runs nice and cool. Link to comment Share on other sites More sharing options...
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