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Part Number:
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 IO-360 Series - 200hp, Stinson 108-3 Only

Univair holds STC approval SA1552NM for the installation of the IO-360* 200hp engine conversion with Hartzell constant speed propeller on the 108-3 Stinson. This conversion is simple and a direct replacement of the Franklin 165 hp engine and related accessories with a more modern, fuel efficient and more powerful Lycoming IO-360 series engine package.

This conversion retains the existing lower cowling; however, it must be modified. A new deeper nose cowl and longer side cowling are required. A new fuel boost pump is required. Because of the installation of the constant speed propeller and related accessories, the battery box must be relocated behind the baggage compartment.

There are standard and wide deck versions of the Lycoming IO-360. To insure that we provide the proper parts for your installation, we need to know which version you have. Information how to determine this is on page 159 of our printed catalog.

Below is a list of major items required for this installation as contained in the Minimum Conversion Kit. This kit will only be sold only as a complete package. Other "detail" items needed for the conversion such as controls, ducting, hoses, etc., can be purchased individually.

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.

*IO-360 engines approved for this STC are IO-360-A1A, -A1B, -A1B6, and -A1C


This kit includes the following:

Part NumberDescriptionQuantity
108-U9001023 Engine mount 1
108-U9001020 Baffle set 1
8000075 Oil cooler 2
108-U9001024 Oil cooler take off 1
108-U9001032 Side cowl assembly 1
108-U9001033 Nose cowl 1
108-U9001040KIT Bottom cowl modification kit 1
108-U9001015-3A Muffler assembly, left hand 1
108-U9001015-4A Muffler assembly, right hand 1
108-6222209-20 Shroud 1
108-U9001034 Exhaust manifold 1
108-6221704 Shroud clip 2
108-U9001010 Flame tube 2
108-U9001016KIT Tailpipe hanger kit 1
108-U9001019 Alternate air box assembly 1
1500-00-44 Auxiliary fuel pump 1
108-U9001021KIT Baffle bracket kit 1
8368 V belt 1
SA1552NM STC paperwork and blueprints 1



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 Shipping policy 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 Shipping policy 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 either UPS Ground Hazmat or Motor Freight (shipping method will depend on the size of your order). 55 gallon drums will incur an additional drum charge of $76.09 per drum.


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 Returns policy page.

To initiate a return, call Univair at 303-375-8882 to receive a return authorization (RA).

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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


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