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Scott,
I know that when my 2.4 was upgraded with 2.7 Mahle's the heads were cut for the new pistons. You could assemble the engine and see how much clearance you have with some clay or solder. Then cut them if they are too close. You may fine you have to cut the piston pockets deeper if you use an "S" cam. You can then get all the cutting done at once. I had to have the pistons cut even though the engine was supposed to be all stock RS parts.
-Andy
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72 Carrera RS replica, Spec 911 racer
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