I'm needing some help guys.i have a 327 in my 66 swb.i was noticing some rocker chatter.so I decided to adjust rockers.loosened each rocker untili head chatter.then toughened the nut down 3/4 turn in 1/4 turn increments.now chatter is even worse.and I'm getting a little popping out of passenger tailpipe when I rev the engine.and I noticed on 2 of the rocker nuts that they were very tight. And it seemed as if they bottomed out. These 2 nuts were much harder to turn.any help with this would be much appreciated
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