There are 2 drawings for part at8946 available in AirCorps Library

Manufacturer's Drawing

Packard,   Packard V-1650 Merlin Drawings,   Page: --,   Revision: bb  

TAP - CYLINDER HEAD SPARK PLUG ADAPTOR +.062 RET'G NUT HOLE (1.125-16 B.S.F. L.H.)

Associated Aircraft:   V-1650  

Manufacturer's Drawing

Packard,   Packard V-1650 Merlin Drawings,   Page: --,   Revision: h  

TAP - CYLINDER HEAD SPARK PLUG ADAPTOR +.062 RET'G NUT HOLE (1.125-16 B.S.F. L.H.)

Associated Aircraft:   V-1650