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Spin the pushrod back and forth with one hand, slowly tighten the rocker nut with the other. When the pushrod stops turning (briefly), you are at ZERO LASH. If you have a hydraulic cam, give the nut another 1/2 turn. This is if you have rocker arm studs with nuts on them, like all high perf heads should from the factory. If you have the non-adjustable type, disreguard what I just posted.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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