How much do classic truck engine swaps cost? Let’s look at everyting compared by cost, horsepower, and reliability. Discover the best engine for your build—from rebuilds to Godzilla power.
engine swap cost for a classic truck? Engine swaps for classic trucks typically cost between $5,000 and $15,000, depending on the engine, transmission, parts, and labor. High-performance builds like Godzilla or Megazilla swaps can exceed $20,000+.
For classic truck lovers, upgrading the powertrain is often a big moment in any restoration. Whether you’re looking to breathe new life into a tired Ford Highboy or transform your vintage pickup into a modern performer, engine swaps represent one of the most significant investments you’ll make in your project.
Engine swap costs vary widely depending on the chosen power plant, with options ranging from simple rebuilds to cutting-edge crate engines.
This guide breaks down the costs, benefits, and considerations for every budget and goal, helping you make an informed decision for your classic truck project.
Don’t have a truck? Read this on where to buy old trucks!
Quick Comparison: Engine Swap Options for Classic Trucks
| Option | Estimated Cost | Best For |
|---|---|---|
| Rebuild Original | $2,500–$4,000 | Collector Trucks |
| Direct Replacement | $5,000–$7,500 | Reliable Drivers |
| Crate Engine | $8,000–$12,000 | Restomods |
| Godzilla/Megazilla | $12,000+ | High Power Builds |
Section 1: Understanding Your Engine Swap Options
Original Engine Rebuilds
- Cost Range: $2,500-4,000
- Best For: Preserving authenticity, budget-conscious builders
- Performance Gains: Modest (10-25% over stock)
For investment-grade collector trucks, maintaining one of the original factory engines typically preserves maximum value. A quality rebuild of your existing engine provides reliability while maintaining the vehicle’s originality. This approach is perfect for collectors and those seeking period-correct performance.
Before deciding on a swap, make sure to check if your current engine can be revived. Many classic trucks sit unused for extended periods, and simple steps to start them safely might reveal that an expensive swap isn’t necessary.
Direct Replacement Swaps
- Cost Range: $5,000-7,500
- Best For: Daily drivers, weekend warriors
- Performance Gains: Moderate (30-50% over stock)
The 302 Windsor V8 from a 1980s-1990s Ford F-150 or Mustang is generally considered the easiest swap, as it maintains similar dimensions to original engines while offering modern reliability and abundant parts availability. These engines provide a good balance of performance, reliability, and cost.
Performance Crate Engine Upgrades
- Cost Range: $8,000-12,000
- Best For: Restomod builds, performance enthusiasts
- Performance Gains: Significant (50-100% over stock)
Modern crate engines deliver impressive power in reliable packages. For those researching the best modern engine swap for Ford Highboy trucks, options include rebuilt original engines, used donor engines, new crate engines, and top-tier builds like Coyote or EcoBoost swaps.
Modern Powerhouse Swaps
- Cost Range: $12,000-15,000+
- Best For: Show trucks, no-compromise builds
- Performance Gains: Extraordinary (100%+ over stock)
The 7.3L V8 Ford Godzilla Engine, available at Kincer Garage, delivers 430 horsepower and 475 lb-ft of torque, offering brute force and unwavering reliability that redefines the driving experience. For those wanting even more power, the Megazilla variant takes performance to the next level.
Real-World Build Case Study
1976 Ford F-250 Highboy with a Godzilla Swap
This real-world build demonstrates what’s possible with a well-executed Godzilla swap in a classic Ford truck.
Build Specifications:
- Engine: 7.3L Godzilla V8 (430hp/475 lb-ft)
- Transmission: Ford 6R80 6-speed automatic
- Engine Management: Ford Performance control pack
- Cooling: Champion 3-row aluminum radiator with dual electric fans
- Exhaust: Custom long-tube headers, 3″ dual exhaust
- Rear End: Ford 9-inch with 4.10 gears and Traction-Lok differential
- Suspension: Upgraded with heavy-duty leaf springs, Bilstein shocks
- Brakes: Front disc conversion, proportioning valve upgrade
Total Investment: $13,700 (including $8,500 for engine, $2,300 for transmission, and $2,900 for supporting modifications)
Owner’s Experience: “The Godzilla pulls like a diesel, sounds like a beast, and drives like a modern truck. Fuel economy is surprisingly decent at 14-16 MPG highway. The truck gets attention everywhere it goes, and the power delivery is incredibly smooth. After 18 months and 12,000 miles, there have been zero reliability issues.”
Lessons Learned:
- Cooling system upgrades are essential for reliable operation
- Transmission choice has a significant impact on drivability
- Custom fabrication for engine mounts saved $800 over pre-made kits
- Modern engine management simplified the entire package
Section 2: The Godzilla & Megazilla Revolution
Ford’s Godzilla Engine (7.3L V8)
- Power Output: 430 hp / 475 lb-ft torque
- Architecture: Cast iron block, aluminum heads, cam-in-block OHV design
- Cost: Approximately $8,500 (base crate engine)
- Best For: High-powered daily drivers, towing applications, restomod builds
The 7.3L Godzilla crate engine from Ford produces 430 horsepower and 475 lb-ft of torque, which is pretty good for a gas engine. Its traditional pushrod design makes it an excellent choice for classic Ford truck engine swaps.
Ford’s Megazilla Engine (Enhanced 7.3L V8)
- Power Output: 612 hp / 670 lb-ft torque
- Enhanced Features: CNC-ported cylinder heads, forged pistons, H-beam connecting rods
- Cost: Approximately $22,995 (base crate engine)
- Best For: Show trucks, premium builds, maximum performance applications
The Ford Performance Parts engine team has unleashed the 7.3L MEGAZILLA crate engine featuring the Ford Performance 7.3L intake manifold, CNC ported cylinder heads, forged pistons and connecting rods. This naturally aspirated monster delivers impressive power without forced induction.
Complete Godzilla Engine Swap Kit Options
For the best engine swap for old Ford trucks, KincerGarage.com offers comprehensive Godzilla swap kits that include:
- Complete crate engine (Godzilla or Megazilla)
- Transmission options (automatic or manual)
- Engine control packs
- Mounting hardware
- Cooling system components
- Exhaust headers designed for classic truck fitment
Read this if you want a full guide to vintage Ford F-Series trucks!
Key Advantages of Godzilla/Megazilla for Classic Trucks
- Compact Design: Despite its displacement, the Godzilla family has exterior dimensions smaller than the classic 460 engine and is only slightly larger than a 351 Windsor
- Compatibility: Shares bellhousing bolt patterns with 4.6L, 5.4L, and 5.0L Coyote engines
- Simplicity: Pushrod design means easier maintenance and modifications
- Torque Profile: Exceptional low-end torque perfect for truck applications
- Modern Technology: Variable cam timing, electronic fuel injection, and sophisticated engine management
Section 3: Complete Cost Breakdown by Category
Budget Option: Original Engine Rebuild ($2,500-4,000)
- Engine teardown and machine work: $800-1,200
- Replacement parts (bearings, gaskets, seals): $500-800
- Upgraded components (as needed): $400-1,000
- Professional assembly (if applicable): $800-1,000
- Supporting systems (cooling, ignition): $300-500
Mid-Range Option: Direct Replacement Swap ($5,000-7,500)
- Donor engine: $1,500-2,500
- Adaptation components: $800-1,200
- Transmission compatibility parts: $500-1,000
- Engine management: $500-1,200
- Cooling system upgrades: $400-800
- Professional installation (if applicable): $1,500-2,500
Premium Option: Crate Engine Installation ($8,000-12,000)
- Base crate engine: $5,000-8,000
- Engine control package: $1,000-1,500
- Transmission adapter: $500-800
- Exhaust upgrades: $800-1,200
- Cooling system enhancements: $500-800
- Professional installation: $1,500-2,500
Ultimate Option: Godzilla/Megazilla Swap ($12,000-25,000+)
- Godzilla crate engine: $8,500-9,500
- Megazilla crate engine: $22,995+
- Engine control package: $1,800-2,100+
- Custom mounting solutions: $800-1,200+
- Upgraded transmission: $2,500-4,000+
- Professional installation: $3,000-5,000+
- Custom tuning: $500-1,500
Classic Truck Engine Compatibility Chart
| Engine | Fits Without Modification | Requires Minor Mods | Requires Major Mods |
|---|---|---|---|
| Ford 302 Windsor | 1967-1979 Ford F-Series | 1980-1996 Ford Trucks | GM/Dodge Trucks |
| Ford 351 Windsor | 1977-1979 Ford F-Series | 1967-1976 Ford Trucks | GM/Dodge Trucks |
| Ford Godzilla 7.3L | None | 1973-1996 Ford F-Series | 1967-1972 Ford Trucks |
| Chevy LS Series | None | 1973-1987 GM Trucks | Ford/Dodge Trucks |
| Dodge Hemi | None | 1972-1993 Dodge Trucks | Ford/GM Trucks |
Section 4: Performance Comparison
Power Output Comparison
| Engine Option | Horsepower | Torque (lb-ft) | Power-to-Weight | Ease of Installation |
|---|---|---|---|---|
| Original 300 I6 | 170 | 283 | Moderate | Very Easy |
| Original 360 FE V8 | 215 | 375 | Good | Easy |
| 302 Windsor Swap | 205 | 300 | Good | Easy |
| 351 Windsor Swap | 250-300 | 350-400 | Very Good | Moderate |
| Godzilla 7.3L V8 | 430 | 475 | Excellent | Moderate |
| Megazilla 7.3L V8 | 612 | 670 | Outstanding | Moderate-Difficult |
Power-Per-Dollar Comparison
| Engine Option | Approx. Cost | Horsepower | Cost Per HP |
|---|---|---|---|
| Rebuilt 300 I6 | $3,000 | 170 | $17.65 |
| Rebuilt 360 FE V8 | $3,500 | 215 | $16.28 |
| 302 Windsor Swap | $6,000 | 205 | $29.27 |
| 351 Windsor Swap | $7,000 | 275 | $25.45 |
| Godzilla 7.3L V8 | $11,000 | 430 | $25.58 |
| Megazilla 7.3L V8 | $25,000 | 612 | $40.85 |
Fuel Economy Impact
- Original engine rebuild: Similar to stock (8-12 MPG)
- Modern carbureted V8: Slight improvement (10-14 MPG)
- Modern EFI engines: Moderate improvement (12-16 MPG)
- Godzilla/Modern swaps: Surprisingly good efficiency for an engine of this size, especially in highway driving conditions
Tuning Needs After Engine Swap
| Engine Type | Initial Tuning | Ongoing Adjustments | Special Tools Required |
|---|---|---|---|
| Rebuilt Original | Carburetor setup | Periodic adjustments | Basic tools |
| Carbureted Swap | Comprehensive | Seasonal tuning | Timing light, vacuum gauge |
| EFI Conversion | One-time computer tune | Minimal | Laptop, OBD interface |
| Crate Engine/Godzilla | Professional dyno tune | Rarely needed | Specialized scan tool |
Reliability Factors
- Original engines: Proven simplicity but aging design
- Donor engines: Variable depending on source
- Crate engines: Excellent reliability with factory warranty
- Godzilla/Megazilla: Designed for heavy-duty truck use with exceptional durability
Section 5: Installation Considerations
Can I swap an engine myself?
While DIY engine swaps are certainly possible, they require extensive mechanical knowledge, proper tools, and significant time investment. Simple swaps like replacing an engine with the same model can be accomplished by experienced home mechanics, but complex swaps involving modern engines often benefit from professional installation.
DIY vs. Professional Installation
- DIY Installation:
- Saves $1,500-3,000 in labor
- Requires specialized tools and equipment
- Demands significant technical knowledge
- Extends project timeline by 40-100 hours
- Professional Installation:
- Ensures proper integration
- Often includes warranty on workmanship
- Typically completed in 1-2 weeks
- Access to specialized equipment and expertise
Supporting Upgrades Required
- Transmission Considerations:
- Original transmissions rarely handle modern power
- Automatic options: C6, AOD, 4R70W, 6R80, 10R80
- Manual options: T18, NP435, T5, TKO-600
- Cooling System Requirements:
- Highboys are known for challenging cooling conditions, especially with larger engines. Upgraded radiators are strongly recommended for any engine swap.
- Modern aluminum radiators with electric fans
- High-flow water pumps
- Braking System Upgrades:
- Disc brake conversions highly recommended
- Proportioning valve adjustments
- Master cylinder sizing
- Suspension Updates:
- Spring rates for increased weight
- Upgraded shock absorbers
- Steering components
Section 6: Where to Source Your Engine Swap Components
Complete Swap Kits
- KincerGarage.com offers comprehensive solutions for Ford truck swaps, specializing in:
- Godzilla and Megazilla crate engines
- Complete engine and transmission packages
- Supporting accessories and components
- High-quality upgraded Ford Performance engines for your dream truck
- Other Reputable Suppliers:
- Ford Performance Parts (factory direct)
- Summit Racing (wide selection)
- TD Motion (specialized swap kits)
Individual Component Sourcing
- Used Engine Sources:
- Salvage yards (budget option)
- Online marketplaces (variable quality)
- Specialty resellers (curated selection)
- New Crate Engine Suppliers:
- Factory programs (Ford, GM, Mopar)
- Performance specialists
- Custom builders
Section 7: Reader Questions Answered
Is it worth rebuilding my original truck engine?
For collector-grade trucks, rebuilding the original engine often preserves value and maintains authenticity. However, if you’re seeking improved performance, reliability, or drivability, the cost of a comprehensive rebuild can approach that of a replacement engine with much better specifications. Consider your goals and budget when making this decision.
How much horsepower does a Godzilla engine have?
The Ford 7.3L Godzilla V8 crate engine produces 430 horsepower and 475 lb-ft of torque in its stock configuration. The upgraded Megazilla version delivers 612 horsepower and 670 lb-ft of torque. Both engines are naturally aspirated (no turbo or supercharger) and can produce even more power with aftermarket modifications.
What’s the cheapest engine swap for an old truck?
The most economical engine swap for an old truck is typically using a donor engine from a salvage yard vehicle of similar make. For classic Ford trucks, a 302 or 351 Windsor from a 1980s-1990s truck or Mustang offers the best balance of cost, availability, parts support, and relatively straightforward installation, with total costs starting around $3,000-4,000 if doing the work yourself.
Will installing a non-factory engine hurt my truck’s value?
For investment-grade collector Highboys, maintaining one of the original factory engines typically preserves maximum value. However, for driver-quality trucks, tasteful upgrades often enhance both value and enjoyment.
Which engines bolt up with minimal fabrication?
For classic Ford trucks, the 302/351 Windsor family offers the simplest bolt-in solution with widely available motor mount kits. The Godzilla engine, while larger, shares the same bellhousing bolt pattern as Ford’s popular 4.6-, 5.0-, and 5.4-liter engines, making transmission adaptation straightforward with minimal fabrication.
What’s street legal in most states?
Emissions regulations vary significantly by state. Generally speaking:
- Pre-1975 vehicles in most states: Nearly any engine swap is legal
- 1975-1995 vehicles: Engine must be same year or newer than the vehicle
- California and states following CARB rules: Engine must be from same emissions tier or newer and retain all emissions equipment
How much does an engine swap cost for a 1970s truck?
Complete engine swap costs for a 1970s truck typically range from $5,000-$15,000 depending on the engine choice, transmission compatibility, and whether you’re doing the work yourself or hiring a professional. Labor often accounts for 30-40% of total project costs.
What transmission fits the Godzilla engine?
The Godzilla engine shares the same bellhousing bolt pattern as Ford’s 4.6L, 5.4L, and 5.0L Coyote engines, making it compatible with modern transmissions like the 6R80, 10R80, and 4R70W automatics. For manual options, the TKO-600 and T56 are popular choices when paired with an appropriate adapter.
Conclusion
Engine swaps represent the heart of any classic truck restoration or restomod project. By understanding the complete cost structure and performance implications of each option, you can make an informed decision that aligns with your budget, skills, and goals.
Whether you choose to rebuild your original powerplant or install a cutting-edge Megazilla crate engine from KincerGarage.com, the key is matching your choice to your truck’s intended use and your personal performance expectations.
The cost to swap an engine in a vintage truck may seem substantial initially, but when weighed against improved reliability, increased performance, and enhanced drivability, it’s often worth the investment. For those seeking the ultimate combination of classic style and modern capability, the Godzilla engine swap kit options provide an increasingly popular path forward.
The classic truck community continues to benefit from expanding options and improving technologies, making this the golden age of engine swaps. Thanks for coming to Get Vintage Vehicles to learn more about what you can do with proper planning and the right components. Your vintage pickup can deliver the perfect balance of nostalgic appeal and contemporary performance.
