.200" on both intake and exhaust? Identical clearance on both? Just trying to clarify - so many people post that they have no problems, and it often means that they didn't measure at all, they just haven't had any problems - yet. With the E, 1.7's and Y heads, I had .110" intake, .210" exhaust. My custom is much milder in terms of duration - so even larger clearance now.