Our billet spin-on oil filter adapter for M90, S38, M88 engines (with the bottom bolt and difficult 4″ diameter canister). Make your oil filter changes quick, clean, and easy. *This does not work with the “top-bolt” style filter system.
-threaded adapter bolt
Replacement filters: Use PH5 or PH25 oil filters or equivalent from 1986-2002 Chevys.
You can download instructions here.