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Purpose of holes in block?

Hotrodhillman

Hotrodhillman

Donation Time
The machinist has a question. What is the purpose of the two large holes in the 1725 block behind the pushrods? Should they be be plugged? Thanks, John1680.jpeg
 
G

Gary T

Gold Level Sponsor
The holes are for core plugs listed as "Plug 1/2" B.S.P. with 1/2" copper washer" They are a threaded shoulder type brass plug with recessed Allen wrench fitting. Refer to Parts Manual Numbers A4 and A5 Plate A-Section A
 
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