Well, mine weren't drilled or wired, until a short time after I rebuilt it. Then it got welded and sealed where the cam pushed the roller into the water jacket, drilled and wired. 
__________________
Jim Hall
“That man has no respect for his Rover and beats
the hell out of it every opportunity he gets, taking
the most difficult line over each and every
obstacle.” Michael
1966 88" 1.9l VW TDI, GT1749V, IC
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