Valve Guide Question

#1
Ive got a Briggs 5HP block that I thought had a bushing in the exhaust valve guide(See Pic). Tapped it and tried extracting it its bending the 2 Steel washers in using to extract it...it wouldn't budge(ive used the same tools on another block with no issue). Is it possible this is really a cast guide? I have the 9/32 B/S Reamer tool. Should I just use that to bore out the hole for the #231348 brass guide.


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#2
After some further cleaning with a dremmel...was able to see that it was the cast guide. Reamed it out with the 9/32 tool then inserted a 63709 brass valve guide and finish reamed it w/ the 1/4 reamer. perfect fit!

Im curious...were some briggs 130202's build from the factory with brass exhaust valve guides?
 
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