Good Evening,
When I purchased my 55 180 it had an O-470R engine. As we looked closer at the logs we couldn't figure out how this was done legally.
Frank Shea has an STC the puts an -R on the earlier 180's. I just purchased this STC to have a legal install on my airplane. I copied an email Frank sent to me with an overview of the STC.
STC #SA00164BO allows a Continental 0-470-R engine to be installed on a Cessna 180, 180A, and 180B. The only requirement in the STC is for the engine mount which is the later cradle style mount, Cessna part number 0751001-1, 0751001-23, 0751001-13, 0751001-25, 0751001-27. The -23 and -25/-27 are the sea plane versions of the -1 and the -13 land plane mount respectively.
The instructions for continued airworthiness are what you would find in the Cessna Service Manual as is the Airplane Flight Manual Supplement. There are no drawings, no parts lists, and no surprises.
Changes will have to be made to the exhaust flanges if you still have the old 2 bolt style. The -R engine has 4 bolt flanges. The cowl to air box junction has been addressed. We have FAA approval for use of the -A, -J, or -K induction system components. These components consist of the 90 degree elbows p/n 535681, riser p/n 538361A1, right side bracket 536036, and left side bracket 566037. This will marry your new engine to your old cowls just as before. No further modifications arerequired and no new cowls!
All McCaulley propellers listed on the type certificate data sheet are included on this STC.
Baffles. If you don't have the later style you will need them.
We worked with the FAA to reduce nearly all of the requirements they wanted such as drawings and parts lists. We wanted this to be applicable to as many as possible and having restrictions would only add time and expense.
Frank Shea
frshea@msn.com
954 609 9139
I hope this helps.
Dave
4567B
Sent from my iPad