Quote:
Originally Posted by SoCalCoupe
Thanks for the feedback. Did you bore out the manifold yourself? Thoughts on where to get advice on steps in the process?
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I used a tool called a "Rota-Broach" to bore out the Merc manifold to match the throttle bores on the carburetor. I used an extra 2G base as a guide and did it with my cheap bench-top drill press. I have done several manifolds (both aluminum and cast iron) with no problems. The Mercury manifolds have plenty of "meat" to allow a 1 7/16" bore. I believe "Ol' Ron" on this forum has said that the Ford 3 bolt carb manifolds sometimes will not accommodate this size without breaking through to the exhaust heat chamber. This is why I grab any late Mercury manifold I come across. A "small base" 2G bolts directly onto the Mercury manifold.