So my friend has a 2000 accord with the 3.0 the rear intake valves keep needing to be re adjusted after high rpm if he drives it like a grandma there's no problem but the first time he gives it any hell the valves start ticking and when we check the clearence the following morning the intake has to large of a gap around 26mm when it's supposed to be 22mm we've set it to 20 still the same issue the tapet nuts are still tight but the gap is too large any advice would be appreciated

 

welcome to the forum. only thoughts come to mind would be cam ware or rocker failure if the adjustment stud/nut remain tight. or rocker arm at cam lobe worn/grinding.

 

I appreciate your response and input and I'll check next weekend for scoring on the cam lobe thanks for the input