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It looks like your 90mm cylinders could have 11 fins with Alusil or Nikasil. I don't know if the fin support is difinitive for your car or not. Notice in the pictures that the cylinders have a distinctly different look to them. The Alusil has a shiny finish almost like someone sprayed clear paint on them. The Nikasil has a standard dull aluminum look. Of course it's easier to tell when looking at them togther but you should be able to tell by this finish. The Alusil basically has glass crystals in it and the material goes all the way through. The Nikasil just has a thin coating on the inside of the cylinder. The outside is just aluminum.
-Andy
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72 Carrera RS replica, Spec 911 racer
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