From an earlier post by me about a newsletter article:
Aircraft Conversion Technologies, Inc. offered STC SA4795SW which installs an O-360 or O-320 conversion in 150's and 152's, and allows a gross weight increase to 1760 lbs. when operated in the Normal Catagory, and within specific CG limits. Operation in the Utility Catagory reverts back to the specific aircrafts original gross weight, with specific CG limits (adjusted for the new W&B with the larger engine). Apparently two placards are furnished for installation, with this and additional information. Since you install all or nothing of an STC, you can't get the gross weight increase without the engine conversion!
There are (or were) other STC's available. Thanks for asking! This might help others, too!
Carl
