OTTO Excavator Parts Zx330-3 6Hk1T Valve Spring Big 8973528886 897352-8886 8-97352888-6 For Isuzu OTTO Isuzu ZX330-3 6HK1T Valve Spring Big 8973528886 – 100% genuine OEM excavator part, perfect fit for Isuzu 6HK1T engines. Bulk in-stock, fast global shipping. Superior elasticity & fatigue resistance vs aftermarket big springs, cuts rework & returns, boosts resale profits for wholesalers & agents.