An agricultural harvester (10, 110) comprising: a harvester frame; a crop harvesting header; and a control arm linkage assembly coupling a rear portion of the header to a front portion of a harvester frame, the control arm linkage assembly comprising: a first upper control arm having a front end pivotably coupled to an upper portion of a first side of the header and a rear end pivotably coupled to an upper portion of a first side of the harvester frame; a second upper control arm having a front end pivotably coupled to an upper portion of a second side of the header and a rear end pivotably coupled to an upper portion of a second side of the harvester frame; a first lower control arm having a front end pivotably coupled to a lower portion of the first side of the header and a rear end pivotably coupled to a lower portion of the first side of the harvester frame; and a second lower control arm having a front end pivotably coupled to a lower portion of the second side of the header and a rear end pivotably coupled to a lower portion of the second side of the harvester frame; wherein a length of the first upper control arm is substantially the same as a length of the second upper control arm and a length of the first lower control arm is substantially the same as a length of the second lower control arm, the lengths of the first and second upper control arms being shorter than the lengths of the first and second lower control arms; wherein the control arm linkage assembly is configured to simultaneously raise the header upward relative to the harvester frame and heel an upper portion of the rear surface of the header towards the front end of the harvester frame in response to an upward force being imparted onto a bottom surface of the header; wherein the front ends of the first and second upper control arms are each located rearwards relative to the front ends of the first and second lower control arms and the front ends of the first and second upper control arms are each located upward relative to the rear ends of the first and second upper control arms; characterized in that the front ends of the first and second lower control arms are each located upward relative to the rear ends of the first and second lower control arms. a harvester frame; a crop harvesting header; and a control arm linkage assembly coupling a rear portion of the header to a front portion of a harvester frame, the control arm linkage assembly comprising: a first upper control arm having a front end pivotably coupled to an upper portion of a first side of the header and a rear end pivotably coupled to an upper portion of a first side of the harvester frame; a second upper control arm having a front end pivotably coupled to an upper portion of a second side of the header and a rear end pivotably coupled to an upper portion of a second side of the harvester frame; a first lower control arm having a front end pivotably coupled to a lower portion of the first side of the header and a rear end pivotably coupled to a lower portion of the first side of the harvester frame; and a second lower control arm having a front end pivotably coupled to a lower portion of the second side of the header and a rear end pivotably coupled to a lower portion of the second side of the harvester frame; a first upper control arm having a front end pivotably coupled to an upper portion of a first side of the header and a rear end pivotably coupled to an upper portion of a first side of the harvester frame; a second upper control arm having a front end pivotably coupled to an upper portion of a second side of the header and a rear end pivotably coupled to an upper portion of a second side of the harvester frame; a first lower control arm having a front end pivotably coupled to a lower portion of the first side of the header and a rear end pivotably coupled to a lower portion of the first side of the harvester frame; and a second lower control arm having a front end pivotably coupled to a lower portion of the second side of the header and a rear end pivotably coupled to a lower portion of the second side of the harvester frame; wherein a length of the first upper control arm is substantially the same as a length of the second upper control arm and a length of the first lower control arm is substantially the same as a length of the second lower control arm, the lengths of the first and second upper control arms being shorter than the lengths of the first and second lower control arms; wherein the control arm linkage assembly is configured to simultaneously raise the header upward relative to the harvester frame and heel an upper portion of the rear surface of the header towards the front end of the harvester frame in response to an upward force being imparted onto a bottom surface of the header; wherein the front ends of the first and second upper control arms are each located rearwards relative to the front ends of the first and second lower control arms and the front ends of the first and second upper control arms are each located upward relative to the rear ends of the first and second upper control arms; characterized in that the front ends of the first and second lower control arms are each located upward relative to the rear ends of the first and second lower control arms.