wetwilly, you are mistaken, the oil bath air breather filters air, not oil wink and it sounds like the guy who talked you out of installing his filter kit did the right thing, the proper filter for the old 6's is a bypass filter available as an option, as pointed out above, and requires no drilling into the oil passages, the holes already exist in the block to install it

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics