(CYL. BLOCK)-PIPE TYPE (P-15-F)-3/8-18 X 3/8
(P-15-F) pipe - Cyl. head & manifold - 3/8-18 x 3/8
(P-15-F)-PIPE-3/8-18 X 3/8
(PLUG CYL. BLOCK OR HEAD)-PIPE-(P-15-F)-3/8"-18 , EFI
(Plug cyl. block rear or Monolithic timing hole side of block)Pipe-(P-15-F)-3/8"-18 , E EXC. SHO
Cyl. block-Pipe type (P-15-F)-3/8-18 x 3/8