From 2 different Chevrolet catalogs.
Important:
By-pass plug over front lower case connection
must be in 5/8" when full flow oil flter is used.
Must be flush when by-pass type or no filter is used.
Note:
When Full Flow Oil Filter is used,
the plug located in the cylinder block
just above the oil filter inlet hose hole,
(lower front) must be driven in
5/8" (.63) below the surface of the boss.
