A Cessna 150 or 152 can have a 150, 160 or 180 HP engine replace the 100 to 108 HP stock engine. Aero Upgrade, LLC 4295 - Nonchalant Circle N – Colorado Springs, Co 80917-205 holds STCs # SA1034SW and STC # SA1052SW for installing a Lycoming 0-320 E2D on most models of 150s.
Morse Aero, Inc - PO Box 164 Riverside Airport – Marcy NY 13403 holds STC # SA544NE for installing a Lycoming 0-290 on a Cessna 150.
Del-Air – 2121 S Wild Cat Way – Porterville, Ca 93257 holds STC # SA4795SW for the installation of Lycoming 0-320 and 0-360 on most models of 150.
Both Bush Conversions and Avcon Conversions are owned by the Bob and Barbra Williams – PO Box 108 – Udall, KN 67146 – 620-782-3851. They build a good conversion but are difficult to reach.
One thing that you must keep in mind when contemplating an power increase is the fact that a bigger engine will burn fuel at a higher rate. The 22.5 gallon tanks that give a 150 a 385 mile range, with reserves, at 74% power and 7,500 feet. Under the same conditions a 0-320 (150 HP) equipped 150 with standard tanks will have a range of 250 miles.
180 HP 150/152s are rare for some good reasons. the 30 hp advantage of the 0-360 is off set by the facts that the 0-360 is heaver, more expensive and thirstier than the 0-320. Most modifiers feel that the added performance afforded by 180 HP engine is just not worth the trade offs that must be made.