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What you have here is a valve keeper. They are used to keep the valve spring in place in the cylinder head on an engine. Please see the link below to ref size. Thx!
Bounty: $6.00
Posted By: HelpIdentify
I'd Like to Know:
What it is, what it does/goes to, manufacturer, where I can find it online
          Item History: None
        
        
        
          Size: 1/4"
        
        
        
          Markings: None
        
        
      
    
        
    Opinions
1)
    What you have here is a valve keeper. They are used to keep the valve spring in place in the cylinder head on an engine. Please see the link below to ref size. Thx!
References:
By: Flyineye Submitted on: 04/12/2016 at 04:03AM
    Accepted