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Made to Order - See Notes Below

 Product Notes

This kit is made to order. Typical assembly time is 1 week if all parts are in stock.

Lycoming O-360 Series - 180hp

Our STC covers the installation of the O-360 series* 180hp Lycoming engine with fixed-pitch Sensenich propeller for the entire 108 Series of Stinsons. The 3/8 inch fuel lines in the 108 and 108-1 will have to be replaced with 1/2 inch fuel lines. This will require a modification of the fittings on the fuel tanks. Univair can supply all the necessary 1/2 inch fuel line components with the exception of the fuel valve. Also, the 108 and 108-1 will require the Rudder Bungee Kit if not already installed. Neither the fuel lines or Rudder Bungee Kit are included in the Minimum Kit; they must be purchased separately from Univair. The 108-2 and 108-3 already have 1/2 inch fuel lines. The 108-2 will also have the Rudder Bungee Kit already installed. The 108-3 does not require the Rudder Bungee Kit as it has a rudder with a pilot adjustable trim tab.

This engine conversion will allow the use of the existing cowling requiring some modifications to the nose and lower cowl.

Below are lists of major items that we require as a minimum of purchased parts from Univair. These Minimum Conversion Kits will be sold only as a complete package. Other "detail" items are needed for the installation. However, they may be purchased individually or from other vendors. These include items such as controls, ducting, hoses, etc.

Note: In developing this STC installation, Univair used the narrow (standard) deck engine. Installations using the later wide deck engines may require minor modifications to the baffling.

*O-360 engines approved for this STC are O-360-A1A, -A1D, -A1F, -A1F6, -A1F6D, -A2A, -A2D, -A1AD,-A2E, -A2F, -A3A, -A3AD, -A4AD, -A4M, and -A5AD


This kit includes the following:

Part NumberDescriptionQuantity
108-U9001023 Engine mount 1
O-360 Baffle set 1
8000075 Oil cooler 2
108-U9001024 Oil cooler take off 1
U14422-B Spinner assembly 1
108-U9001059 Carburetor air box 1
108-U9001064 Exhaust manifold 1
108-U9001015-3A Muffler assembly 2
108-6222209-20 Shroud 1
108-6221210-20 Shroud 1
108-6221704 Shroud clip 2
108-U9001061 Flame tube 2
108-U9001062 Bracket 1
108-6221710 Muffler hanger 2
11950-004 Leather gasket 1
108-U9001002-2 Oil pressure tube 1
108-6222101-10 Fuel line 1
108-U9001002-56 Oil cooler tube 1
108-U9001002-57 Oil cooler tube 1
108-U9001002-58 Oil cooler tube 1
108-6022421 Eyebrow 1
108-U9001051 Alternator adjustment arm 1
3L320 V belt 1
SA2718NM STC paperwork and blueprints 1


ABOUT RETURNING THIS KIT: To receive a refund, this kit must be returned to Univair FULLY INTACT. All parts, hardware, manufacturer’s packaging, installation instructions, etc. included in the kit must be included in the return. Kits returned to Univair with missing parts will be shipped back to the customer at customer’s expense.

We do not guarantee that all items for sale through our website, catalog or advertising are in stock at all times. Price and availablility is subject to change without notice. Univair reserves the right to charge you the current price of the item at the time your order is fulfilled/shipped, not the price at the time your order was placed. For further details, see this article in our Knowledge Base or contact our sales department during regular business hours.

To the extent that the trademarks or registered trademarks of an original equipment manufacturer other than Univair are mentioned on this website, the name of that manufacturer is only for descriptive use and does not imply any affiliation with, manufacture by or endorsement by the respective owners of such trademark. Many products of Univair are replacement products for products of original equipment manufacturer of the aircraft. Univair to the extent required by Federal law obtains approval from the FAA for the manufacture of replacement parts for aircraft. The reference to the name of the original manufacturer is for identification purposes only and not to represent the original manufacturer is associated in any way with the Univair product.

 Shipping & Returns


Univair charges ACTUAL SHIPPING COSTS on all shipments. The shipping charges calculated during checkout are ESTIMATES only. We will adjust your final invoice depending on the size, weight and number of packages being sent. Full details can be found on our How We Calculate Shipping Costs page.

Free Shipping Promotion

Orders over $300.00 may qualify for free ground shipping within the contiguous United States. Orders over $3,000.00 may qualify for free motor freight (truck) shipping within the contiguous United States. Full details can be found on our Free Ground Shipping Information page.

Shipping Hazardous Materials (HAZMAT)

Products classified as Hazardous Materials (HAZMAT) cannot be shipped outside the contiguous United States (lower 48 states). 5 gallon and 55 gallon sizes will only be shipped via Motor Freight; smaller sizes can be shipped via UPS Ground Hazmat. Full details can be found on our Restrictions on Shipping Hazmat Items page.


All items returned to Univair for a refund or credit must be authorized in advance. Additional conditions apply. Full details about our return policy can be found on our How to Return an Item page.

To initiate a return, call Univair at 303-375-8882 to receive a Return Merchandise Authorization (RMA).

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Univair Aircraft Corporation

2500 Himalaya Road
Aurora, Colorado 80011

Toll Free Sales: 888-433-5433
Phone: 303-375-8882
Fax: 303-375-8888

Hours of Operation
Monday - Friday — 7:30am-4:30pm MT
Saturday - Sunday — Closed

© 2022 Univair Aircraft Corporation. Prices and availablility are subject to change without notice.

All product and company names are trademarks or registered trademarks of their respective owners. Univar's descriptive use does not imply any affiliation with or endorsement by the respective owners.

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