Broken timing gear

[BBBDLGCON@aol.com]

 Hi All,
   This is is not an EFI question but I was hoping someone could point me in 
the right direction. I recently acquired a 1987 Buick Park Avenue with a 
broken 3.8 engine. I removed the valve covers and timing chain cover. The cam 
sprocket failed probably because of slack in the timing chain or the cam 
button ( I think ). The engine has 79,000 miles and seems to have been well 
maintained. Is this a common occurrence and should I proceed to pull the 
valve gear and heads to look for further damage? Any help would be greatly 
appreciated and please contact me off list. Thanks, Bruce B.
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