Wellworthy Hillman 14HP Pistons Set +030 1937–40 Humber Hawk NOS

Wellworthy Hillman 14HP Pistons Set +030 1937–40. Box markings indicate application for Hillman 14 HP models (1937–1940), with noted compatibility for Humber Hawk (1945–1948). Pistons are marked “423 M9 V +030 OT”, confirming +0.030 oversize.