Continental GTSIO-520-L Engine – For Cessna 421C Golden Eagle

The GTSIO-520-L is the ultimate performance engine for the Cessna 421C. Featuring a turbocharged, fuel-injected, and geared six-cylinder configuration, this 375 horsepower engine was designed for high-speed cruise and smooth, efficient operation in the pressurized twin market.

All Continental GTSIO-520-L engines sold by Air Power come standard with a Tempest Spin-On Oil Filter and full set of Tempest Spark Plugs for peak reliability and performance.

Aircraft Application

• Cessna 421C Golden Eagle

What We Need to Know to Properly Spec Your GTSIO-520-L

• New or rebuilt?
• Left or right engine position?
• 12V or 24V electrical system?
• Oil-heated fuel manifold valve? Yes or No
• Alternator configuration? (standard or custom output)
• Intercooler and baffle layout? (if modified/STC airframes)

Continental RFQ Process

Some GTSIO-520-L engine specs for the 421C are low frequency builds and may require a Request for Quote (RFQ). Air Power will handle the RFQ submission and provide pricing and lead time updates within 5–7 business days.

Why Air Power?

We are Continental’s largest distributor worldwide and their preferred engine partner. Whether you’re replacing both engines or need to match an existing serial number, we’ll help you get the right configuration, factory-direct pricing, and industry-leading support.

Contact Air Power today to get the right GTSIO-520-L engine for your Cessna 421C.