Quote:
Originally Posted by flatford39
What do you know about the engine. Did you rebuild it or is it an unknown used engine. Could be a ton of things. I am thinking piston slap right now. How much compression do you have?? If you have decent compression it could be wrist pins.
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When I bought the car I pulled the head and replaced it with a 5.5. I noticed 4 new pistons and 8 new valves with very little carbon. That is all I know about the engine. Idle and low RPM is fine anything above that results in loud clatter.