[dtw]

Are you checking the engine case/barrels/heads to find out why it is leaking? Take a 2nd look at what Chris is saying. On a mag-case 911 engine, especially larger/more powerful ones, it is critical that you get your parts measured out by a machine shop experienced with 911 engines. The engine case likes to 'walk' or 'relieve' over time, resulting in a leaky engine.

I bought a 'zero-mile rebuild' 2.7 last year with documentation. Threw it in the car and fired it up. Drove it all summer but it leaked like a sieve. Tore it down in the fall and found all kinds of problems. Head sealing deck was uneven, case deck uneven, pulled studs, you name it. Including head work (guides were shot), ended up spending $1,700 on machine work.