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I think they are different, according to this post by simon they are anyway.

EDIT: just checked and RB20DE/DET bore and stroke are the same, and i believe all RB headgaskets are 1.3mm, so that really only leaves the pistons to be different. Check on JE/CP etc website and have a look. I CBF doing that for you :P

http://www.skylinesaustralia.com/forums/topic/438851-rb20det-300kw-range/#entry7198368

Edited by iruvyouskyrine
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Im of the same opinion as GTSBOY that the na and turbo pistons are different. Na pistons different to gain a higher compression ratio. What do you plan on doing? Can always run a thicker head gasket to get the same compression. Although not ideal.

cheers Josh

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