If you’re into high-performance engines, you’re probably familiar with the Morel 7717 and LS7 lifters. These lifters are among the most popular choices for performance engine builders, but choosing between the two can be a tough decision. In this article, we’ll take an in-depth look at both lifters and compare their features, pros, and cons, so you can make an informed decision for your next engine build.
Contents
What Are Lifters?
Before we dive into the specifics of the Morel 7717 and LS7 lifters, let’s take a moment to understand what lifters are and why they are essential for high-performance engines. Lifters are small components that sit between the camshaft and the pushrods in an engine.
Their primary function is to convert the rotational motion of the camshaft into the vertical motion of the pushrods, which then actuate the engine’s valves. Lifters play a crucial role in controlling the valve timing, which affects the engine’s power, torque, and overall performance.
Morel 7717 Lifters
The Morel 7717 lifters are a popular choice for high-performance engines, particularly in racing applications. These lifters are designed to withstand high RPM and heavy valve spring pressures, making them ideal for engines with aggressive camshafts and high lift rates.
One of the key features of the Morel 7717 lifters is their oil metering system. This system ensures that the lifters receive a consistent oil supply, even at high RPMs, which helps to prevent lifter failure and extends their lifespan. Additionally, the Morel 7717 lifters have a lightweight design that reduces their mass and allows for higher RPM operation.
Pros:
- Designed for high RPM and heavy valve spring pressures
- Consistent oil metering system
- Lightweight design
Cons:
- Can be noisy
- Relatively expensive compared to other lifters
LS7 Lifters
The LS7 lifters are a factory OEM lifter used in the high-performance LS7 engine found in the 2006-2015 Corvette Z06 and the 2014-2015 Camaro Z/28. These lifters are known for their durability and performance, making them a popular choice for LS engine builders.
One of the unique features of the LS7 lifters is their design, which includes a roller bearing on the lifter’s bottom surface. This bearing helps to reduce friction and wear, which enhances the lifter’s durability and performance. Additionally, the LS7 lifters have a hydraulic design, which provides consistent valve operation and reduces engine noise.
Pros:
- Factory OEM lifter used in high-performance engines.
- Durable and long-lasting.
- Roller bearing design reduces friction and wear.
Cons:
- Not designed for extremely high RPM or aggressive camshafts.
- Relatively heavy design.
Morel 7717 vs LS7 Lifters: Comparison Table
To help you compare the Morel 7717 and LS7 lifters side by side, we’ve created a comparison table:
| Features | Morel 7717 Lifters | LS7 Lifters |
| RPM Range | High RPM | Medium to High RPM |
| Oil Metering System | Consistent oil supply | Hydraulic lifter design |
| Noise | Can be noisy | Quiet operation |
| Durability | Excellent | Excellent |
| Price | Relatively expensive | Reasonably priced |
| Design | Lightweight | Relatively heavy |
| Performance | Designed for racing | OEM performance |
Which Lifter Is Right for You?
Choosing between the Morel 7717 and LS7 lifters ultimately comes down to intended use. If you’re building a high-performance racing engine that will see high RPM and heavy valve spring pressures, the Morel 7717 lifters may be the better choice for you. Their lightweight design and oil metering system make them ideal for these applications, even though they can be noisy and relatively expensive.
On the other hand, if you’re building an LS engine for street use or moderate performance applications, the LS7 lifters may be the better choice. Their durable construction, hydraulic design, and roller bearing system provide excellent performance and longevity, making them a reliable choice for daily drivers or weekend warriors.
Final Thoughts
Comparing Morel 7717 vs LS7, both have their strengths and weaknesses. The Morel 7717 lifters are designed for high-performance racing applications, while the LS7 lifters provide reliable performance for street or moderate-performance use. Carefully consider the features, pros, and cons of each lifter before making your choice, and you’ll be sure to end up with a high-performing engine that meets your expectations.