Best Deals on Fairly Used 70 hp Outboard Motor from Alpha Marine

When it comes to finding the best deals on a fairly used 70 hp outboard motor, look no further than Alpha Marine. We pride ourselves on offering unbeatable prices without compromising on quality or performance. Whether you’re a seasoned boater or just starting out, upgrading your engine doesn’t have to break the bank.

At Alpha Marine, we understand the importance of reliable and affordable boating equipment. That’s why we source our inventory carefully, ensuring that every motor meets our high standards of quality. Our fairly used 70 hp outboard motors offer excellent value and performance, allowing you to enjoy your boating adventures with confidence.

Don’t miss out on the opportunity to enhance your boating experience with a powerful yet affordable engine. Explore our selection of fairly used 70 hp outboard motors today and find the perfect match for your needs. With Alpha Marine, you can trust that you’re getting the best deals without compromise.

Key Takeaways:

• Alpha Marine offers unbeatable deals on fairly used 70 hp outboard motors
• Upgrade your boating experience without breaking the bank
• High-quality motors that meet our strict standards
• Enjoy powerful performance at an affordable price
• Trust Alpha Marine for reliable and affordable boating equipment

Understanding the 1987 454 Magnum Engine

The 1987 Checkmate boat is equipped with the original 454 Magnum engine, but there may be confusion about its true specifications. The Mercruiser decal on the valve cover states that it is a 454 Magnum with a horsepower rating of 330. However, it is important to note that the 330 engines have certain characteristics such as a cast crank, 2 bolt mains, smaller rod bolts, and “peanut” heads. On the other hand, the Magnum engines have a forged crank, 4 bolt mains, better rods, and heads.

It is believed that the Magnums may have been detuned in 1987 due to the presence of the Alpha drive. Understanding the internal parts of your engine is crucial when considering a minor build to achieve a goal of 450 HP.

Engine Specifications	1987 Magnum 454	1987 330 engine
Crank	Forged crank	Cast crank
Main Bolts	4 bolt mains	2 bolt mains
Rod Bolts	Better rods	Smaller rod bolts
Heads	Better heads	“Peanut” heads

Having a clear understanding of your engine’s internal parts will help you make informed decisions when it comes to power upgrades and achieving your desired horsepower.

Exploring Power Upgrades for the 1987 454 Magnum

If you are looking to increase the power of your 1987 454 Magnum engine, there are several options to consider. While some may suggest using the peanut port heads along with cast internals to reach 450 HP, it is important to note that oval port or rectangular port heads are a better choice for higher RPMs and increased torque.

Upgrading the cam and heads is crucial for achieving your horsepower goal. Additionally, aftermarket heads or GM rectangular ports can provide better performance. It is also recommended to consider a roller cam for improved performance. However, it is important to keep in mind that modifying the engine should be done with careful consideration of the fuel, ignition, electrical, and safety aspects to ensure reliability and prevent any potential hazards.

Differences Between Automotive and Marine Engines

When it comes to increasing the power of your boat’s engine, it is important to understand the differences between automotive and marine engines. While both share a base engine, marine engines are specifically designed to withstand the harsh conditions of boating.

In a marine environment, safety and reliability are paramount. Marine engines are equipped with parts that are specifically rated for their ability to prevent fires and explosions, ensuring the safety of your boating experience. These specialized components provide the peace of mind you need when out on the water.

Moreover, marine engines are constantly under load, constantly challenged by the forces of wind, waves, and unpredictable conditions. This requires precise fuel and air mixtures to prevent detonation and ensure optimal performance. Marine engines are engineered to deliver the power and efficiency needed in these demanding situations.

Modifying a marine engine for power upgrades requires careful consideration to maintain reliability and prevent premature engine failure. It is essential to choose components that are specifically designed and rated for marine applications, ensuring the engine’s performance and longevity.

Key Differences Between Automotive and Marine Engines

• Specialized parts designed for safety and reliability in a marine environment
• Precise fuel and air mixtures to prevent detonation
• Engineered to withstand constant load and challenging conditions
• Modifications should be made using marine-rated components

When it comes to power upgrades in your boat’s engine, prioritizing safety, reliability, and longevity is crucial. Opting for marine-rated components ensures that your engine performs at its best and operates safely in the unique conditions of boating.

Aspect	Automotive Engines	Marine Engines
Safety and Reliability	Standard safety features	Specialized parts for fire and explosion prevention
Fuel and Air Mixture	Optimized for land-based driving conditions	Precisely calibrated for marine performance
Load and Conditions	Varies based on driving conditions	Constant load and challenging marine environment
Modifications	Flexible to accommodate various upgrades	Require marine-rated components for reliability

Rating Changes in Outboard Motors

In the history of outboard motors, there have been significant changes in the way they are rated. Prior to 1986, outboard engines were traditionally rated at the flywheel. However, starting in 1986, manufacturers made a shift and began rating their outboard engines at the prop. This change in rating methodology has had implications for comparing outboard motors and understanding their performance.

Before this shift occurred, a 1985 model outboard motor might have a higher horsepower rating compared to the same engine model from 1986 when rated at the prop. This means that when comparing motors from different years, it is essential to consider the rating changes that took place and the impact they may have on performance expectations.

To illustrate the rating changes in a more comprehensive manner, here is a comparison table showcasing the horsepower ratings for a specific outboard motor model from the flywheel rating era and the prop rating era:

Year	Flywheel Rating (HP)	Prop Rating (HP)
1985	85	–
1986	–	80
1987	–	78
1988	–	75

This table demonstrates how the horsepower rating changed over the years, with a decline in the prop rating compared to the flywheel rating. It is important to take these rating changes into account when comparing outboard motors and evaluating their performance capabilities.

Considerations for Power Upgrades in Boats

When it comes to power upgrades in boats, we understand the importance of considering a few key factors. Our top priorities are always safety and reliability. Adding automotive parts to a boat’s engine may compromise both, as marine-rated parts are specifically designed to withstand the harsh marine environment.

It is crucial to ensure that any modifications made to the engine are done with a comprehensive understanding of the fuel, ignition, and electrical systems. This is essential to prevent potential hazards and maintain optimal performance.

Proper research and consultation with experts in the field can provide valuable insights and guidance. They can help ensure that power upgrades are executed correctly, enhancing performance without sacrificing safety and reliability.

Conclusion

Upgrading the power of your boat’s engine can greatly enhance its performance and ultimately improve your overall boating experience. However, when considering power upgrades, it is crucial to prioritize safety and reliability. By using marine-rated parts and understanding the unique requirements of the marine environment, you can ensure a smooth and worry-free upgrade process.

At Alpha Marine, we offer unbeatable deals on fairly used 70 hp outboard motors. Our motors are known for their trusted quality and performance, providing you with the perfect opportunity to upgrade your boating experience without compromising safety or reliability.

When undertaking power upgrades, we always recommend consulting with experts in the field. Their knowledge and expertise can help ensure that any modifications made to your engine are done correctly and safely. By taking this proactive approach, you can enjoy your upgraded boating adventures with peace of mind, knowing that your engine is both reliable and powerful.

Whether you’re seeking improved performance or simply want to enhance your boating experience, power upgrades can make a significant difference. Just remember to prioritize safety and reliability, and make use of trusted brands and experts in the field. With Alpha Marine’s unbeatable deals on fairly used 70 hp outboard motors, you can embark on your next boating adventure with confidence, knowing that you have the performance, safety, and reliability you deserve.

FAQ

What is the best place to find deals on fairly used 70 hp outboard motors?

Alpha Marine is your go-to source for unbeatable deals on fairly used 70 hp outboard motors.

What are the specifications of the 1987 454 Magnum engine?

The 1987 Checkmate boat comes equipped with the original 454 Magnum engine. The Mercruiser decal on the valve cover states it is a 454 Magnum with a horsepower rating of 330. However, it is important to note that the 330 engines have certain characteristics such as a cast crank, 2 bolt mains, smaller rod bolts, and “peanut” heads, while the Magnum engines have a forged crank, 4 bolt mains, better rods, and heads.

How can I increase the power of my 1987 454 Magnum engine?

To increase the power of your 1987 454 Magnum engine, you can consider upgrading the cam and heads with oval port or rectangular port heads for higher RPMs and increased torque. Aftermarket heads or GM rectangular ports can provide better performance. It is also recommended to consider a roller cam for improved performance. However, it is important to carefully consider the fuel, ignition, electrical, and safety aspects when making modifications to your engine.

What are the differences between automotive and marine engines?

While both share a base engine, marine engines are specifically designed to withstand the harsh conditions of boating. Marine-rated parts are essential for boating safety as they are specifically rated to prevent fires and explosions. Marine engines also require precise fuel and air mixtures to prevent detonation due to constant loading. Modifying a marine engine should be done with careful consideration to maintain reliability and prevent premature engine failure.

How have the ratings of outboard motors changed over time?

Prior to 1986, outboard engines were rated at the flywheel. Starting in 1986, manufacturers began rating their outboard engines at the prop. This means that an engine from 1985 may have a higher horsepower rating than the same engine from 1986 when rated at the prop.

What should I consider when upgrading the power of my boat’s engine?

When upgrading the power of your boat’s engine, it is important to prioritize safety and reliability. Marine-rated parts should be used to withstand the harsh marine environment and maintain safety. It is also crucial to have a comprehensive understanding of the fuel, ignition, and electrical systems to prevent any potential hazards. Consulting with experts in the field can help ensure that modifications are done correctly and safely.