Quote:
Originally Posted by Nikzilla
Should I just disassemble the head and check the clearances?
Also, could it just be air in the hydraulic lifters?
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Holy shit no. Please do not go straight into the block to solve this problem. If your car is running fine but making noise at a specific RPM, it is a harmonic issue. Locate the source of the rattle first. Use long screw drivers as stethescopes if you feel the noise is inside the block. It would probably be best to do a simple compression test.
What type of exhaust do you have?