Ferrea dual valve spring with damper supplied as a 16-piece set, specified with 1.225–1.570 inch diameter, 1.04/1.56 OD and 0.74/1.145 ID in the description. This full set is intended for installations matching those dimensional parameters and provides the complete complement needed for a multi-valve cylinder head service.
Ferrea 1.225in to 1.570in Dia 1.04/1.56 OD 0.74/1.145 ID Dual w/Damper Valve Spring - Set of 16