IF you have no history or don't know it's been done, get it changed!!!
Reason why -
This leads to the inevitable of valves clattering pistons. This results in this -
Forgot how much of a pain it is to lap in new valves by hand. Prefer hand lapping as opposed to drills as it's less 'brutal' -
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Then had the joys of refitting valves springs and collets -
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This is an 8 valve engine but though i would post it up as some people may be intrigued by the pictures and results of a snapped belt!!