GSM Inc. Vertical "Full Flow" Oil Filter Kit for Lycoming Engines
This is an 90 degree oil filter adapter fully machined from 6061-T6 billet aluminum and anodize in black. It is similar to other adapters on the market but only weighs 17.2 oz. made of billet rather than cast aluminum. 
 
The GSM Inc. vertical "full flow" oil filter kit is designed to offer Lycoming engine owners several advantages over the standard Lycoming oil screen or filter hardware. This kit repositions the filter in a vertical orientation, delivering two primary benefits:
Optimized Installation Space
The filter is mounted in "free" space, allowing installation in engine compartments with minimal firewall clearance—areas where only an oil screen might otherwise fit.
Improved Accessibility
The vertical orientation provides easy access for maintenance, eliminating the need for awkward hand positions or risk of injury during filter changes.
Clean Filter Changes
When it’s time to replace the filter, a simple prick punch in the top of the filter allows oil to drain back into the sump, preventing spills during removal. This eliminates the need to clean the accessory case, lower cowl, or nose gear area.
Product Features
No moving parts and no required maintenance.
Compatible with Champion aviation oil filters.
Fits most Lycoming engines with dual magnetos.
Temperature probe hardware transfers directly from the OEM screen housing or filter adapter.
Fully bolt-on installation—no interference with standard engine accessories, including vacuum pad-driven alternators and baffling.
Sturdy, accessible safety wire anchor simplifies securing the filter.
Note: Always verify adapter and filter clearance within the engine compartment prior to final installation.
Kit Includes:
Filter housing
Washers, seal rings, and gasket
Installation instructions
Installation Limitations and Compatibility
Piper Aircraft (Metal Fuselage – Single & Twin Engine):
Not compatible due to interference with the top center tube of the five-point engine hard mount.
Exception: The Piper PA-38 Tomahawk is supported, as it uses a four-point mount.
 
Lycoming O-235 Series: May not be supported—verify compatibility before installation.
Piper Aircraft (Fabric Fuselage):
Generally compatible with all Lycoming-equipped models using a four-point engine mount, unless prior modifications cause interference.
Grumman Aircraft:
Grumman AA-5B Tiger (Lycoming 180 HP):
Not compatible due to clearance issues.
All other Grumman models with listed Lycoming engines:
Should be compatible unless previous modifications result in interference.
 
Experimental Adapter with gasket, bolts and instructions for Retrofit Lycoming Engine Models: 0-235, 0-290, (O, GO, GSO -425), (IGO, IGSO -480), (O, IO, HIO, TIO, AEIO, LTIO -540), IO-720 (O, IO, LIO, AIO, AEIO, -320), (O, IO, LIO, HO, HIO, TIO, AIO, AEIO -360) with 2/MAG & 2 Drive ONLY
(EXPERIMENTAL ONLY)
Adapter and Gasket kit ONLY (No Oil Filter Included) Some applications require a spacer between the adapter and accessory case. 8130 Form are not available for this adapter