i have a fresh motor with a hydrolic roller cam. i have run,set the valves at o then half turn with the eoic method. after starting the car and let it run for 10 min. the rockers start to get noisy,pull the valve covers and notice a couple have come loose(not from the polylocks,but within the valvetrain). also added a stud girdle and they still worked their way loose. what could it be?. im almost ready to give up. :confused:.

If the polylock is still tight, and the stud is still tight in the head, then Either you didn't have the pushrods properly seated in the cups, or something is wearing/bending. (or you didn't adjust the rockers properly)

You say its a "fresh" motor. Did you check valve train geometry, pushrod length, retainer clearance to valve seal and rocker arm, coil bind on springs? Is your motor a 'retro-fit" or OEM roller block? Do you have the correct lifters for block type? Even a hydraulic roller can cause issues with all the above. Not knowing the details of your build makes it REAL hard to diagnose.

its a doug herbert 555

On the rockers that have come loose have you checked for bent push rods?

I am curious how this plays out because I have this same problem with my brothers 327 with with a solid roller polly locks and stud girdles. They will all get loose in about 50 miles. We pulled the motor and will get back to it later when we have more time.

yeah it just baffels me that a completely new motor would have the valves come loose, i will check the push rods within the next week or so, i just want to rule everything out before i call herbert and ask them to figure this out. the motor is a 555 short block,with brodix bb2 extra heads, edelbrock rpm ramgap intake,the cam is a doug herbert part # cbh7 witch is a cam withe the rpm range of 2500-6700 ,the( int.-dur.-exh. at 278/286)(AT 0.50 IS 242./246 the total lift is (.642/.663). at 110c. if this helps at all?

Did you put the "flat" side of the trunion up so the polylock can seat on it? If you have the rounded side of the trunion up it can cause the problems you are describing.

Did you put the "flat" side of the trunion up so the polylock can seat on it? If you have the rounded side of the trunion up it can cause the problems you are describing.

He's talking about the trunion "inside" the roller rocker that slides down over the rocker stud. And, he's correct..... FLAT side UP.