Oil passage to rocker shaft

Can someone take a look at a bare head and tell me the size of the oil passage where it junctions in to the rocker shaft bolt hole? Thanks!

 

Rhett,

When I drill that passage for a set screw I use a #7 drill before I tap it for a 1/4" set screw. So it is slightly smaller than 1/4" to begin with.
I would say it starts out as 7/32nds. or slightly smaller.
What kind of problem are you experiencing??? Still lifters ticking above 2500 RPM's???

Tom T.

 

Hey Tommy!
Ill give you a call in the AM. Ive still got issues with lifter oiling.

 

I should be home by 9am give or take.

 

what kind of issues..... ?????

 

well thats a long story but I thought some mods Tommy and I had done were allowing oil pressure to bypass the lifter galleys. It wasnt the case.