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I have been looking closely at the engine here and it seems that the bores for the exhaust and intake valves are reversed. Normally the intake valve is larger than the exhaust valve (It is for this particular engine: http://www.lcengineering.com/LCTechPages/techpages/TechNote49.htm) but it seems to be flipped on the model of the head in this case from what I can tell, meaning the exhaust valve is the larger of the two. A small detail, but just though I would let you know. Thanks!