Thanks for all the tips guys. That sucks about the SHS piston, maybe I'll have to swap it for a Lonex/Modify.
Also, turns out my whole issue was that the pad wasn't sitting properly. I'm using a Modify cylinder head and it has a raised concave portion where the air passes through. It's a funnel rather than a straight hole and the opening is raised from the back surface of the cylinder head, so any sorbo pad has to have a MASSIVE hole in it to accomodate this feature. My sorbo was sitting on top of the funnel portion rather than around it which added a good mm or so.
Last edited by paulwes83; March 20th, 2015 at 23:42..
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