Rip off the valve cover and take a look. Could be a loose rocker, or a rocker has loosened to the point that it's not holding the pushrod down, causing the pushrod to shoot up into the valve cover. Could be a number of things, but you need to check it out to find the problem.
Dave
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Dave 88 GT - 13.4@106 on street tires (2.2 60ft)
My Stang
RHC member #75
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