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Reply to "Question regarding intake manifold exhaust heat passages."

George, I did replace the 4300 with a Holley 600, not because of the poor performance, but because of the failed attempts to stop the leaking between the top and bottom bowl, I didn't want to replace the manifold at this time. I tapped the hole, 1/2 13 thread, and used the allen style set screw like you listed. Worked well.

It pains me to move away from originality, but the car has to be able to be driven reliably. 

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