are these euro pistons?

[haycait911]

in tearing down my 3.0, I've got to the pistons. without removing a cylinder to see part #'s, can I tell if these are euro pistons? the piston top is 'peakier' than a regular 3.0 cis piston ( which I have in hand to compare) . the hollows are more defined and the high spots are more pronounced, or 'steeper'. any input much appreciated. Don.

[haycait911]

pistons out and now have pics. the one on the left is the piston in question. what's the verdict? euro or no?

[Early_S_Man]

Nope, those are both cast CIS pistons, 'normal,' and 'S' ... the Euro RS or Carrera piston is a slipper-skirt, forged, conventional, low-dome, 8.5:1 piston with two valve relief cuts.

[Vin-barrett]

That looks like a USA 3.0 CIS piston. 1980-1983

[haycait911]

thanks guys.

[haycait911]

OK, I've dug into my other 3.0, #930-10. and just want to clarify. this is a CIS 3.0 9.3:1 piston?



and these are pics of a ROW 3.0 9.8:1 piston?







and one more thing. which of these pistons would be better to run webers with stock camshafts? I have concerns over the 9.8 CR due to our crappy gas here. thanks, Don.

[Vin-barrett]

Yea, you got it

I don't think there is much difference between the two but maybe others will chime in.
I switched from 9.3 to 9.8 only cuz my 9.3's were Alusil and we get 93 octane here in NJ.

heres another 9.8 pic