i have 92 prelude si and when i first got the car i can hear the valves they are noisy, and when i went to a shop to do a valve adjustment, the noise went down but i can still hear the valves, and now its pretty loud again so im going to get valve adjustment again soon, but should a h23a engine be relatively quiet when normal? mine is pretty loud, it has almost 150k miles on it already

 

H23s are all loud..

 

I think u should swap a H22 in there..... 150K is kinda a lot....