How do you guys feel about 2.7's?, Tell me the good and bad. Options

[speed metal army]

Looking at a 2.7.Is there some things(besides the obvious wear,compression etc.)that I should look for?Is it a worthwhile swap?Thanks guys!

[Dave_Darling]

Cons:
- Many were overheated, in some cases pretty badly
- The mag cases were pretty marginal for the displacement and power that was made with them
- They like to pull studs
- The case halves like to move around with you get to good power levels
- They love to leak oil, even more than other 911 engines
- They have one of the earlier chain-tensioner designs which is neither the "almost never fail" hydraulic version nor a fail-safe version

Pros:
- All of the above can be fixed. It just takes money; in some cases a lot of money
- The 911 guys don't like them, so they tend to go for cheap
- Most of the ones that are running around today have had at least some of the problems fixed; many have had most of them fixed
- The mag case means they are lighter than the later aluminum-cased motors
- You can build a pretty stout engine from them, if you're good and if you're careful

Not all of the 2.7s around today have had all of the problems fixed. You have to be careful if you just want to stuff one into a car and run it. If you're rebuilding anyway, it may not be all that much more to fix the typical 2.7 issues than the basic rebuild.

The 74 2.7s tend to be a little less beat-up than the 76-77 ones, because they didn't have the STUPID FRACKING thermal reactors on them.

Heat can be a real killer. I have a friend who bought a 75 911S that had a recently-rebuilt motor. He time trialed it and saw the oil get up to 260F. It started losing compression and oil pressure immediately after that. He sold the car at a (sizeable) loss to someone who could rebuild the engine themselves.

--DD