There has been some recent speculation that the timing chains on the GT350 and GT350R were different due to an ad copy Ford Performance posted. As I suspected it was a mistake in the wording of the ad and there has been an update to the Ford Performance website. From everything I've heard, read and seen all the engines in the GT350's and GT350R's are identical.
Incorrect Ad:
Updated correct Ad:
Incorrect Ad:
Updated correct Ad: