QUOTE(Bill D @ Aug 18 2006, 11:47 AM)
If he is looking for a 912 because he thinks it will be less expensive than a 911 to repair then he is mistaken. An engine rebuild can be very expensive and more parts will need to be replaced. The case cracks around the oil cooler. The crankshaft can only be turned once. The oil pump is part of the front case cover. The valve guides have no shoulder and can fall in if the old guides were not removed properly...
An earlier 911, 2 liter or 2.2 litre, has a MINIMUM of twice the engine longevity of a 911, and often they run 300K miles (that's about 4X). The cost of rebuilding one of these is roughly the same as a 912, given the cost of case repairs, German pistons and cylinders, and a new crank. This has been true for at least 25 years. As others have said, CHECK FOR RUST. For some reason, the 912s are much harder on the nose pan. Might be the generator/alternator difference, I dunno. I've replaced about 20 of them on 912s, and maybe 1 or 2 on 911s. The cabin floors get so thin you can stick a pencil through 'em, too.