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Over time it's pretty easy to tell if your engine is running excessively lean... of course you already have a lean burn engine so running even leaner is risky, but if you find that you are burning and bending valves or burning holes in your pistons then you are running to lean, with your engine design your spark plugs are getting a rich charge so it will still start and run ok, other pattern I've noticed with people who've removed the warm air intake thermostat controlled flap is head gaskets don't hold up either, not sure if it's connected, but engines that are running lean tend to burn hotter then designed.
Did you find any charts to see what your ideal intake size is? to large of an intake and you loss momentum and loss efficiency.
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