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I've been mostly a lurker on here a while under username dollastudios but couldn't get logged back in so new account. My 19 poor baby after 5k miles had never had a valve check. I know it's recommended at 600, 2500 etc. Intermittently was experiencing a loud hollow pop, thunk noise when Rev to down shift or sometimes before take off at a light. Only happens with a rev blip while clutch pulled.. Seems to occur after running wot for a bit or when hot. Thought maybe just need Valve adjust. After breaking a feeler off in the intake valve I just took the head off. End up installing tb cam, flat head piston, ported stock head with larger valves: set to i-. 003 e-.004..should I loosen up exhaust? Getting the thunk slightly more often now. Although it runs fine otherwise valve train is as I've read for others a bit more noisy
 

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Any evidence of a valve hitting your piston?
 
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