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Try to run a 70%water and 30% coolant mix with some water wetter aded to the system. The higher water ratio will absorb the heat from the engine faster than a 50/50 mix. Sounds crazy, but crazy enough to work.
Your pinging is likly caused by ignition of the gas/air mix in your cylinder before the spark of the spark plug. This causes temperature and pressure peaks that will melt your piston, crack your cylinder head, and drop one of your exhaust valves.

Try running test check to see if your timing is not too far advanced, make sure your compression ratio is not too high, try useing some higher octane gas and see if it helps a little.

Last edited by 93montero_sr; 10/02/08 05:49 AM.