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Hi guys a newbi here as far as posting but have been lurking around for awhile. You all seem pretty versed on the goings ons with motors as am I to a point. The issue I had this weekend did not invlolve my boat but my motorhome. I figured you all are up on your big block chevy stuff on this site so I would post it up on here and see what you guys thought.

I left friday night in the coach all was well for about 70 miles when all of a sudden at a stoplight I hurd a loud ticking, pulled away from the stop all felt good,continued down the road and the ticking seemed to get a little louder so I pulled over to give it a listen and came to the conclution that it was a valve ticking and i would check it out after I got to the camp site. Three miles later I had exsaust coming back through the carb like the valve wasn't opening, had to park it. I pulled the vavle cover off to find a broken rocker arm. A hole the size of the vavle stem in the number five exsaust valve. Dam lucky it didn't drop the valve as it was pushing down on the retainer. I put a new rocker on it drove it home on sunday with just a miss at idle and under power it seems fine. I have not looked into it any farther.

Do you guys have any ideas of what could have caused the rocker arm to wear like that and what I should be looking for? Any help would be great.

The coach is a 1990 chevy chassis with a 454 but it is not the origanal engine and the heads look like they have been done recently. that is the only info I know on the engine other than it did run great before this but it dose make a bottom end noise around 3000 to 4000 rpm. it has made that since I bought it two years ago, not sure what it is. And it hasn't blowen up yet. Any help would be great.

Thanks guys,
Paul
 

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Depending on the age of the rocker, its was either its time, which is USUALLY a looooong time, or if it was a new rocker when the top end was done, or if the rockers were "surfaced" then the heat treat was wrong on that one, maybe all of them? , or it they ground thru it when resurfacing it.
The oil plays a huge part in stock rockers. More so on the pivot ball, but the valve end too. Most oils today are no friendlier to skid ball rockers then they are to flat tappets.

I would check all the others for obvious wear, and FOR SURE, disassemble the valve spring on the one that you lost the rocker. If the rocker was riding that retainer like I think it did, those locks took a beating. Yes, you got very lucky.



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