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Hi, I have the 650 Sand Spider 2 cylinder I've written about here before. I put in the Fast Freddie weber kit, Fox AirShox with limit straps and long travel, modified/built a better header, fixed the lighting (including flashing blue and amber rear safety lights), put on paddles in the back and made my own front runners from worn-out stock tires, and tore up the dunes at Dumont. Well, I couldn't get clear to the top, not enough power, which I'll be working on. Anyway, after a particularly gnarly high speed run, it started missing a little. I cleaned the carb jets (gotta love a Weber) and made sure everything was as it should be externally, but when it idles, the valve cover breather is blowing out a lot of blowby. Is this normal? Do others have a lot of blowby? Did I break a ring? Is there a list of ring sizes to possibly cross reference a set of Zero Gap Second rings? Has anyone tried a crankcase evacuation system using drag race car evac setups? Is there a hotter cam for this motor? Are overbore pistons available? Has anyone run this motor at sustained high speeds?