Continental GTSIO-520-H Engine – For Cessna 421A & 421B Golden Eagle

The Continental GTSIO-520-H is a geared, turbocharged, fuel-injected six-cylinder engine engineered for high-performance pressurized twins like the Cessna 421A and 421B Golden Eagle. Rated at 375 horsepower, this engine delivers smooth, efficient power through its reduction gearbox, offering impressive cruise performance and fuel economy at altitude.

Every GTSIO-520-H engine ordered through Air Power includes a Tempest Spin-On Oil Filter (if applicable) and a complete set of Tempest Spark Plugs—both standard equipment on factory new or rebuilt engines.

Aircraft Applications

• Cessna 421A Golden Eagle
• Cessna 421B Golden Eagle

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

• New or rebuilt?
• Left or right engine position?
• 12V or 24V system?
• Pressurized or non-pressurized magnetos?
• Alternator type and amperage? (if non-standard)
• Cooling and baffle configuration? (especially on modified or STC aircraft)

Continental RFQ Process

The GTSIO-520 series has many variations depending on aircraft model year and electrical system configuration. Some specs may require a Request for Quote (RFQ) through Continental. Our team will handle the RFQ and return accurate pricing and lead time—usually within one week.

Why Buy From Air Power?

Air Power is the largest worldwide distributor of Continental engines and their preferred supply partner. Our team specializes in complex twin installations like the 421 and provides accurate engine spec matching, factory-direct pricing, and ongoing support.

Let us help you order the right GTSIO-520-H engine for your 421A or 421B—reach out for a quote today.