Stop jumping around like a flamenco dancer and start doing some logical diagnosis.

1. What is the oil pressure?
2. Are the valves adjusted properly?
3. Get a semi-quiet exhaust installed so you're not trying to listen around exhaust noises.
4. Remove the fan belt and run it for a SHORT time (no water circulation) to see if the noise changes or stops with the water pump and generator not turning.
5. Use a broomstick or a stethoscope to try to isolate the location of the noise.
6. Have someond hold the clutch pedal down with the transmission in gear to see if the noise changes or goes away with the transmission input shaft not turning.

When you can give us specific answers to all these questions, somebody can probably point you in the right direction. Until then, everything you're being told is just a S.W.A.G.

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!