Guaranteed Auto Repair in Billings, Your Auto Repair and Engine Experts

The auto repair experts at Guaranteed Auto Repair know sheer horsepower better than anyone. Whether you own a BMW, Corvette or classic muscle car, we can tune up your stock engine to hum perfectly.

When you are ready to install a new competition level crate engine and complete rotating assembly come to Guaranteed Auto Repair the high-performance auto repair experts that drivers in Billings trust. From Chevrolet to Edelbrock and Mast Motorsports we have the expertise to turn a sports car into a high-performance racing machine.

Let us drop-in a new set of pistons, improve your engine oil and lubrication system or upgrade your valvetrain. Every day the expert mechanics at Guaranteed Auto Repair give engines an extra boost with high-flow cylinder heads and multiport EFI. No build is too big at Guaranteed Auto Repair. Stop by our auto repair shop at 3906 1st Avenue S or call today at 406-208-6740 and let's talk horsepower.

Roush, Edelbrock, Chevrolet and More

Roush Engines
Combining engineering with racing, Roush founded Roush Performance Engineering in 1976 and began selling high-performance engine designs to the world of motorsports. His racing team's ability to win and a brilliant solution-oriented approach to building engines earned Roush a reputation associated with excellence.

Discover More About Engine Repair Services At Guaranteed Auto Repair in Billings

4X4 Services
Undercar Services: Maintenance
Transmission Repair Services