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The one piece that the main spring and spring guide rest on/go into just needs to be shortened about 2-3mm. Put it in a vise, mark 2-3mm with a permanent marker then proceed to file the fuck out of it. That should get you between 350 and 380 and give you far better gas mileage if your still to hot, file off about 1/2 mm at a time between testing till you're good.
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