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The leanest i can go while still being powerful enough to move the car without misfire is 20.5 afr with timing around 45 degrees advanced, that's using a home made plasma ignition and brisk multi gap resistor-less plugs. i looked into the cyclone intake manifold, and it shuts off one runner to a intake valve at low throttle to create a swirl in the head, i would like to try one, i might be able to run leaner still. also i would be interested in learning more about your prechamber plugs.
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