fits make: Johnson, Evinrude, Omc. year: 1969–2020.

( Brand: Omc ), ( Part Type: Hp Cylinder Head Bolt ), ( Manufacturer Part Number: 381151 ), ( Country Of Origin: United States )
Introducing the OMC 381151 Johnson Evinrude Cylinder Head Bolts, specifically designed for use with Johnson and Evinrude outboard motors from 1969 to 1972 with a horsepower rating of 18 to 20. These bolts are an essential component of your engine's structural integrity and ensure optimal performance.
Each bolt is meticulously crafted from high-strength material to provide superior tensile strength and resistance to corrosion. They feature a hex head design, enabling easy installation and removal with standard socket tools. The hex heads are also chamfered, allowing for a secure seating of the gasket and ensuring a tight seal between cylinder heads.
These bolts come in a pack of twelve, ensuring that you have more than enough to complete a full engine assembly. The length of each bolt measures approximately 1.5 inches, providing ample thread engagement for a secure fit. Additionally, they are torqued to specifications to ensure proper engine assembly and prevent potential issues such as head gasket leaks.
The OMC 381151 Johnson Evinrude Cylinder Head Bolts are an important investment for any Johnson or Evinrude outboard motor enthusiast or professional technician. With their superior strength and corrosion resistance, these bolts will help ensure the longevity and reliability of your engine.
In summary, these bolts are a must-have for any repair or maintenance project on a Johnson or Evinrude 18 to 20 hp outboard motor from the 1969 to 1972 model years. Their high-strength design, hex head configuration, and easy installation make them an essential addition to your toolbox or parts inventory.
When maintaining or rebuilding an old Johnson or Evinrude outboard motor, replacing the cylinder head bolts is an essential task. Original equipment manufacturer (OEM) parts, such as the OMC 381151, are often the best choice for ensuring optimal engine performance and longevity. In this analysis, we will discuss the advantages and disadvantages of purchasing OMC 381151 Johnson/Evinrude cylinder head bolts for outboards from 1969 to 1972 with 18 to 20 horsepower.
Pros:1. Guaranteed Fit: OEM parts, like OMC 381151, are designed specifically for your engine model and year. This ensures a perfect fit and eliminates the possibility of compatibility issues.
2. Quality and Durability: OEM parts are manufactured to meet the highest standards. These bolts are expected to last longer than aftermarket alternatives, providing better value over time.
3. Warranty Coverage: OEM parts often come with a warranty, giving you peace of mind knowing that the manufacturer stands behind their product.
4. Enhanced Engine Performance: Using OEM parts guarantees that all components are working together optimally, potentially improving engine performance and efficiency.
Cons:1. Cost: OEM parts, like the OMC 381151, tend to be more expensive than aftermarket alternatives. However, the potential for longer lifespan and improved engine performance may offset the initial cost.
2. Availability: Depending on the engine model and availability, it might take longer to source OEM parts compared to aftermarket options.
3. Limited Customization: OEM parts offer no room for customization, whereas aftermarket parts might provide additional features or options.
Conclusion:When considering the purchase of OMC 381151 Johnson/Evinrude cylinder head bolts for outboards from 1969 to 1972 with 18 to 20 horsepower, the decision ultimately comes down to your priorities. If you value a perfect fit, superior quality, durability, and potential engine performance enhancements, an OEM part like the OMC 381151 is the recommended choice. However, if cost and availability are primary concerns, an aftermarket alternative may be a more practical option, despite potential compatibility issues or reduced lifespan.
Recommendation:If the goal is to maintain or restore an outboard engine to its original specifications and ensure optimal performance, we strongly recommend investing in the OMC 381151 Johnson/Evinrude cylinder head bolts. While the upfront cost may be higher, the benefits of a guaranteed fit, superior quality, and potentially enhanced engine performance may translate to long-term savings and satisfaction.
As shown in pics. Removed from a 1972 Johnson 20hp outboard. The plug threads are good.