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I've set out on the adventure of shimming my valves for the first time. I've got all the clearances documented so now just on to the shimming part. Anyway when I took the carbs off I noticed there is a fair amount of a carbon looking substance built up on the backsides of the intake valves. Is this normal? Is there a way of cleaning them up without actually taking the valves out? It looks like it's a total PITA to go anyfurther then removing the camshafts/buckets and followers.