What engine letters stand for. Mariella Endlicher March 7, 2014 News From Diamond T Classics 0 RXB 4&1/2 inch bore RXC & RXLD 4&5/8s inch bore RXLD 4&3/4s inch bore all have 5&1/4 inch stroke. Related Posts VENDERS-SUPPLYERS-NEW PARTS IN THE MESSAGE BOARDS Paul R. Gordon passed away on Tuesday, March 16th. REO trucks Shirts hats and other Diamond T things. Leave a Reply Cancel ReplyYour email address will not be published. Required fields are marked *CommentYou may use these <abbr title="HyperText Markup Language">HTML</abbr> tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong> Sign up to our newsletter