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Old 06-17-2013, 11:13 AM   #12
because I can
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 9,116
I have seen and machined a lot of heads for 14mm bottom plugs. I have only seen around four crack. I have never seen one crack around the top 14mm plug. All four cracks were between the bottom 14mm crack and an exhaust seat. A couple of the bottom plugs were machined noticeably off center and closer to the exhaust than the intake but I know from experience that getting all that lined up takes some time that apparently not all are willing to make. I have seen a lot of bottom plugs favor one side over the other. I had 12mm plugs put in my dual plug setup.
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