Quote:
Originally Posted by Brotok
There was a thread on this topic posted earlier this year, but after an hour of searching I have not found it.
I am planning an engine drop on my 1979 911 SC, the car has close to 300k miles on it and is tracked. While in there, I plan to do the following:
- Clutch
- Valve adjustment
- Check for vacuum leaks (which I know there are plenty of)
- Change worn cams (probably)
The car runs poorly (seems like it's on 5 cylinders while at low engine speeds - ignition appears to be working fine though), so I am hoping that between the air leaks and the cam/valve adjustment I might solve the problem. To be diligent, what else does everyone advise I should do while the engine is out?
Thank you.
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Sounds like a need for a complete rebuild to me.

With 300k Miles, seriously consider a valve-job and re-ring the pistons plus new bearings for the crank and I-shaft.
Replace the exhaust row of head studs with steel ones. (Some people do all)
Regrind the cams to 964-profile.
New chain sprockets on the I-shaft plus new chains and ramps.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats.

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