On my friend's 261 he put the valve in the breather, which has the exhaust tube removed. Vacuum runs off the intake tap, and around the front of the block.
[img]http://www.myoldtruck.com/gallery/files/2/3/8/Engineleft.jpg[/img]
[img]http://www.myoldtruck.com/gallery/files/2/3/8/Engineright.jpg[/img]


Fred
52 3600
69 C-10