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Registered User
Join Date: Feb 2006
Location: Ireland
Posts: 93
1975 2.7 Pistons/Cylinders ?

I have a early 1975 911 2.7 probably built in 74, its not a 911S not sure what model exactly.

What pistons and cylinders could this era of 911 have originally?

I am about to commence a rebuild replacing all seals bearings and piston rings, but I,ve heard some pistons and cylinders should not be taken apart and are unusable if they are!!!

Thanks for the help.
1975 911 3.0 Carrera (964 Lookalike Weekender)
1975 911 2.7 (Project)
1979 Ford RS2000
1980 Mini 1275GT
1998 BMW 320i (Daily driver/Reliable Work Horse)
Old 03-08-2006, 06:09 AM
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Registered User
Join Date: Oct 2004
Location: S California
Posts: 5,888
Your pistons and cylinders are either Mahle or KS. More importantly they are either Nikasil or Alusil cylinders. The Nikasil cylinders have a shinny finsh and are slightly magnetic. The Alusil cylinders have a dull grey finish and are not magnetic. Some people don't recommend re-ringing the Alusil cylinders and other say it is OK. Some people also recommend not taking the pistons out of the cyllinders on a rebuild and leaving the rings alone. If you can find a good used set of Nikasil cylinders it is worth the money. Keep in mind that the pistons are not interchangeable between Nikasil and Alusil cylinders.
1970 911E Sportomatic Albert Blue
1971 911T Sunroof Coupe w/ Twin Plug 2.5 MFI
1973 911E Glacier Blue
1973 911E RSR Tribute Viper Green w/ 3.5 Twin Plug MFI
Old 03-08-2006, 03:08 PM
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