A draper head for a combine, the draper head comprising: a center section adapted for attachment to a feederhouse of the combine and provided with a center feed assembly, the center feed assembly including a rear frame, first and second belt frames (102a, 102b) arranged side by side, each supporting a drive roller (150a, 150b), an idler roller (154a,154b), and a belt (114a, 114b) extending between the drive roller (150a, 150b) and the idler roller (154a, 154b); first and second wings (42, 46) extending in opposite lateral directions from the center section, each of the first and second wings (42, 46) including a draper belt operable to feed crop material toward the center section; and a cutterbar extending along the center section and the first and second wings (42, 46); wherein the center feed assembly is configured to convey the cut crop material into the feederhouse in a direction parallel to a travel direction of the combine and perpendicular to the draper belts and a transverse axis of the head; characterized in that the center feed assembly further includes a bulkhead extending from the rear frame, and a front frame pivotally coupled to the bulkhead opposite the rear frame, that each of the first and second belt frames (102a, 102b) includes an inner bracket (142a, 142b) and an outer bracket (146a, 146b), that the drive roller (150a, 150b) and the idler roller (154a, 154b) extend between the inner bracket (142a, 142b) and the outer bracket (146a, 146b), that the front frame is engageable with the outer brackets (146a, 146b) of the belt frames (102a, 102b) to move the second belt frame relative to the first belt frame and vice versa in response to pivotal movement of the front frame; that the head comprises a plurality of movable float arms configured to support the flexible cutterbar, that the front frame is coupled to at least one of the plurality of float arms such that movement of the at least one float arm causes the front frame to pivot; that the first and second belt frames (102a, 102b) are each pivotable relative to the rear frame; and that the second belt frame is movable relative to the first belt frame in response to flexure of the flexible cutterbar. a center section adapted for attachment to a feederhouse of the combine and provided with a center feed assembly, the center feed assembly including a rear frame, first and second belt frames (102a, 102b) arranged side by side, each supporting a drive roller (150a, 150b), an idler roller (154a,154b), and a belt (114a, 114b) extending between the drive roller (150a, 150b) and the idler roller (154a, 154b); first and second wings (42, 46) extending in opposite lateral directions from the center section, each of the first and second wings (42, 46) including a draper belt operable to feed crop material toward the center section; and a cutterbar extending along the center section and the first and second wings (42, 46); wherein the center feed assembly is configured to convey the cut crop material into the feederhouse in a direction parallel to a travel direction of the combine and perpendicular to the draper belts and a transverse axis of the head; characterized in that the center feed assembly further includes a bulkhead extending from the rear frame, and a front frame pivotally coupled to the bulkhead opposite the rear frame, that each of the first and second belt frames (102a, 102b) includes an inner bracket (142a, 142b) and an outer bracket (146a, 146b), that the drive roller (150a, 150b) and the idler roller (154a, 154b) extend between the inner bracket (142a, 142b) and the outer bracket (146a, 146b), that the front frame is engageable with the outer brackets (146a, 146b) of the belt frames (102a, 102b) to move the second belt frame relative to the first belt frame and vice versa in response to pivotal movement of the front frame; that the head comprises a plurality of movable float arms configured to support the flexible cutterbar, that the front frame is coupled to at least one of the plurality of float arms such that movement of the at least one float arm causes the front frame to pivot; that the first and second belt frames (102a, 102b) are each pivotable relative to the rear frame; and that the second belt frame is movable relative to the first belt frame in response to flexure of the flexible cutterbar.