Thanks guys. I appreciate the info. a valve job here is $200 and I will take the head off. What lead to the compression test is that I had a loud noise comming from the mid low section end of the motor. at first, I thought I might have a tranny problem, but shifting between gears are flawless and smooth with no griding. So, I firgure out its not the tranny. and after the noise problem, my car would slow down when driving, like no fuel comming through the injectors. I replace the prelude injectors and put RC 310 on, the noise went away. now I am running very rich. I dont know what do you guys call this noise, but when you run very rich, the fuel that remain unburn poping through the exhaust and make this ugly sound. putting the RC 310 fixed the injectors problem but Im running rich now and its better than running lean. I guess if I bend some valves, I would have to replace them. Anyway, HOW DO YOU DO A LEAK DOWN TEST??? I HAVE THE HAYEN MANUAL BOOK AND WILL CHECK ON THAT BUT IN THE MEAN TIME, IT WOULD BE NICE FOR SOME TO TELL ME HOW. THANKS