Upgrade and secure your engine with this high-quality head bolt set, designed for GM 2.5L (153 CID) and 3.0L (181 CID) 4-cylinder engines. Perfectly suited for marine applications, this set is compatible with Mercruiser, OMC, Marine Power, Chris Craft, and Volvo Penta engines. Engineered to ensure a tight and reliable seal, it includes all 10 head bolts required for a complete installation. Please note: This set does not include the two end bolts with studs on top. Compatible with 120 HP and 140 HP engines across all years, these bolts are a durable and essential solution for maintaining peak engine performance. Made in the USA and backed by a 1-year warranty. Engine Quest produces high-quality OE-style replacement parts. Each part undergoes rigorous testing and inspections to meet EngineQuest's exact specifications. Designed for precision manufacturing and durability, our products ensure easy installation. With nearly 500 SKUs available, the company specializes in hard-to-find, in-demand parts, including those no longer available from the OEM, difficult to salvage, or with prohibitively high OEM costs.