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KobaltBlau KobaltBlau is offline
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Join Date: Mar 2004
Location: City of Seattle, WA
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yes, I am absolutely sure that is a CIS piston. The dome is a very specific swirl-inducing design, see there is still crappy valve clearance because that dome isn't in the middle, and there is no relief in it. 3L CIS pistons are shallower than that one, but I do believe that is a 2.7 CIS piston. Here's the old for sale thread the shot came from:

fs;2.7 nikasil cis 911s pistons/cylinders like new
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Andy
Old 09-02-2004, 10:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)