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Message: <blockquote data-quote="GDTrumbo" data-source="post: 856926" data-attributes="member: 10665">Dude! They only modified the exhaust ports slightly. You won't see any difference at the head/manifold interface opening. If you do a profile check every 5mm along the port from valve seat to the manifold opening on both heads, you will see the difference. Dave Sobota and I did the 2V drawing mods and the mathematical checkpoint layouts for the CMM. 2 "cubed" castings were CMM checked and X-rayed per shift. Handz, Handz, Handz :angry7: Lying doesn't get me anything. Research the casting #'s.</blockquote>