Mike B, Re. this 261 would be full pressure oiling but not full flow filtering. As far as I know the only full flow filter motor was the 261s with the LARGE 1/2" pipe thread oil lines out to the giant filter. And these could be set up for full flow filtering only if the plug on the driver's side is pushed in, if it's out it would bypass the filter. Not sure what year these large oil lines began, earlier ones also can be modified for full filtering.

Re. the side motor mounts I'm not 100% sure, varies by year but my '61 261 has dilled side mount bosses in a large triangle lay out. Where my early 55 1st series 261 has different bosses which I believe are like the early 50s passenger but not drilled out. I can shoot some pics if you need, send me a pm.

Jim
attaching a site with some good pics.
http://www.siegmundguitars.com/261.html
http://community.webshots.com/album/582015144KMkrFk

Last edited by JiMerit Boltr#43; 12/18/2011 11:14 PM.
It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed