Correct cylinders for 1994 964

[993buyer]

Hi All,
Are these considered to be the correct cylinders for a 1994 964?
Thanks! Q.

[Henry Schmidt]

964 103 915 22 is the correct number for the piston and cylinder set for a 1994 Porsche 964.

[993buyer]

The box shows the correct number for later model 964's, however the cylinders and pistons seem to be the earlier cylinders/pistons....

[Henry Schmidt]

Originally Posted by 993buyer

The box shows the correct number for later model 964's, however the cylinders and pistons seem to be the earlier cylinders/pistons....

The pistons and cylinders shown in the pictures are definitely the late style 964.
Early 964 cylinders had the conventional style sealing surface No gasket and no head support around the studs.. Much like the 3.2 Carrera cylinder.
There were two different late cylinder types that used gaskets. One used the asbestos/paper gasket and the other used an aluminum ring style gasket.
The cylinder pictured appears to use the asbestos style gasket.

[993buyer]

Does either have an advantage over the other, Henry?
Thx. Quinn

[Henry Schmidt]

Originally Posted by 993buyer

Does either have an advantage over the other, Henry?
Thx. Quinn

The aluminum ring is the later style so at least one engineer at Porsche or Mahle thought it was a better idea.
I don't have enough information to give a definitive answer.

[brp914]

ok, I'm even more confused than usual. PET lists 964.103.915.22 for use in M64.01, 02, which is C2 NA, as well as M64.50 - which is 964 Turbo. ?!?!?!

PET lists 964.103.915.25 for use in M64.01/02, after 1991, only - not turbo. Did 964 turbo and NA use the same pistons?

[Henry Schmidt]

Originally Posted by brp914

ok, I'm even more confused than usual. PET lists 964.103.915.22 for use in M64.01, 02, which is C2 NA, as well as M64.50 - which is 964 Turbo. ?!?!?!

PET lists 964.103.915.25 for use in M64.01/02, after 1991, only - not turbo. Did 964 turbo and NA use the same pistons?

The 91-92 964 Turbo was actually 965. It was a full fin 3.3 liter engine. 97mm bore.
These are definately not those pistons/cylinders.
I don't know what later Ps&Cs look like but something in my memory tells me they had a elivated deck piston.

[superninety]

I show the part number that I used for the updated P&Cs for my 964 to have been

964-103-915-22

These are the upgraded P&Cs and appear to be the same as your photos

Been in the car for several years now.