OTTO Excavator Parts Cxh50S 6Wa1 Valve Spring Big 8976033056 897603-3056 8-97603305-6 For Isuzu OTTO Isuzu CXH50S 6WA1 Valve Spring Big 8976033056 – 100% genuine OEM excavator part, perfect fit for Isuzu 6WA1 engines. Bulk in-stock, fast global shipping. Superior elasticity & fatigue resistance vs aftermarket big springs, cuts rework & returns, boosts resale profits for wholesalers & agents.