Washer from GTR L19 kit in place in the VQ35DE cylinder head, and you might be wondering why I would even check? And the answer is that the OEM GTR head bolt had a larger flanged neck which does not fit into the little machines spots in the head without flushing the surrounding area with the bolt surface. Also there is a little interference with the actual cylinder head casting that holds the lifter buckets that you would have to grind down if you decided to use them