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Generally just normal wear and tear. Also if a rocker arm is too loose it may cause abnormal wear, loose hydraulics usually have a loud clicking sound to them. Another cause could be a plugged oil galley from the cam shaft bearing, if this happens, normally you will not have oil at the valve rocker arm.
What else can I help you with?
Does a 1991 Chevy 350 have a roller or flat tappet cam?
That would be the flat tappet cam in that engine.
How can I tell if a Chevy 350 is a roller cam or flat tappet?
If it has center hold-downs on the rocker covers, it's probably a roller cam.
You are building a 1990 350 Chevy you are running 9.35 to 1 flat top pistons the bore is .030 with a RV cam what plug gap do you recommend?
you can use stock 350 plugs
Chevy 350 cam specs?
More information is required to answer this question properly. The best way is to pull the casting # off of the block. Is it a truck 350? car? year? roller? flat tappet?
What causes low oil pressure in rebuilt 350 Chevy?
Not sure, i would say oil pump or cam bearings
What is the cam type of the 2011 Lexus IS-350?
The 2011 Lexus IS-350 has double overhead cam (DOHC).
What is the cam type of the 2008 Lexus IS-350?
The 2008 Lexus IS-350 has double overhead cam (DOHC).
What is the cam type of the 2009 Lexus IS-350?
The 2009 Lexus IS-350 has double overhead cam (DOHC).
What is the cam type of the 2013 Lexus IS-350?
The 2013 Lexus IS-350 has double overhead cam (DOHC).
What is the cam type of the 2012 Lexus IS-350?
The 2012 Lexus IS-350 has double overhead cam (DOHC).
What is the cam type of the 2007 Lexus IS-350?
The 2007 Lexus IS-350 has double overhead cam (DOHC).
What is the cam type of the 2010 Lexus IS-350?
The 2010 Lexus IS-350 has double overhead cam (DOHC).
