Universal 5411
Craig,The first question you should ask yourself is how are you going to use the boat? The 5411's HP rating is fine if you seldom motor (i.e. sail alot) or only use it as an auxiliary to get in and out of you slip or if you're going to be a live-aboard. If you plan on cruising where you will eventually have to power into headseas or winds. Then the 5411 will be underpowered for the Catalina 30. I had a 5411 swinging a 3RH13X11 prop, and in anything but slack water the boat was a slug. But, you know what? The 5411 was a whole $400 cheaper than an M3-20 in 1982! Also, some racers opted for the 5411 because it was a little lighter than its bigger brother. If you decide you can live with the 5411 afterall because someone is going to give you the boat, then here's some additional itmes to consider;1. Check to see if the freeze plugs have been replaced. Early models (1980 is early) had a problem with steel plugs. See Dick Dickens tech manual.2. Be aware that the cooling system operates backwards from anything you've ever seen. The thermostat actually closes when the temperature rises to allow raw water to enter at the blending -T.3. Because of the design of the cooling system, the motor is prone to impeller failure.4. Because of the age of the boat, the motor probably needs a head gasket. Also, the raw water pump should be replaced if use is greater than 500 hours. Stick with an exact replacement; the pump is a Sherwood. 5. The fuel pump is engine driven on the starboard side of the motor.6. Catalina coupled the motor to a Federal driveline dampner to smooth things out. Mine was galled to the propshaft head and had to cut the shaft to get apart.7. This motor is really underpowered for the Catalina 30. When you look at the HP curves for the motor, the max output is 12 HP. Take into account the HP taken off to spin the alternator (and other mechanical losses) and there is really approx. 6 HP available to spin the shaft.8. Because the motor is raw-water cooled, you don't have the ability to make hot water via the water heater. This may seem a minor point, depends on your cruising use.