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I used to have a Thunderbird Super Coupe that made quite a loud knocking sound when cold, especially when accelerating. It would disappear as soon as the engine warmed up. It was caused by a piston that had a bit too much (.001" over the max.) clearance on the skirt. Changed the one piston and it was perfect after that.
Wayne
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Don't get caught dead, sitting on your seat belt.
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