I agree with TedRamAir. Get your hands on the motor to feel for the noise. I would get the car in the air enough to get under it. On stands or ramps. A lift would be best. Take all the belts off so there are no external accessories being driven. You wont run it long enough to overheat it. Get under it and put your hands on the pan. Use some sort of stethoscope tool to listen for it.
You running 1.5 rockers or 1.65?
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