what are these pistons?

[tref]

They were on an early 2.0 aluminum case with center lube cams. It's the 1st time I see the oil ring below the piston pin. Does anyone know if these are the worth anything, they will eventually go on ebay.

Thanks,
F.

[tom1394racing]

These look like '65-'68 911 normal "slipper skirt" pistons.

Mahle P/N should be 80V37 or 80V65.

[Flat6pac]

I put a 66 together last year that had the lower control ring.
Bruce

[tref]

Thanks for your replies, the marking on the pistons indicate :

80V37 = Mahle, compression ratio 9.0:1, 1965-67

Does the fact they have this oil ring under the pin makes them more/less desirable?

[304065]

Tom, I guess they are "slipper skirt" type insofar as the skirt is not perfectly cylindrical.

I had the same pistons in my '66. The issue isn't with the location of the oil control ring, although modern pistons have it up above the pin (and generally have smaller skirts for less friction). The issue is that the ring grooves are probably worn out from 44 years of use. Even if the diameter is OK, if the grooves are worn and new rings are installed they will immediately break.

If they are in spec they probably have value to a restorer who wants complete originality. For performance applications there are more modern pistons available with higher compression, anti-detonation grooves, narrower rings, shorter skirts, and dry film lubricant.

One area where modern pistons are on par or inferior to the old ones is weight, however.

Search here for "jugs and slugs" for more information.