we just finished droppin an ls vtec into my friends rex. its pingin. its runnin CTR pistons. were usin 93 octane + octane booster+retarded timing as far as it will go. I hear valve chatter sometimes. This is what pinging sounds like right? can someone tell me how to tell detonation and prevent it. also, we havent tuned the cam gears too. its got STR cam gears. what precautions should be taken when drivin it? thanks