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150 West Street,

Sunbury, PA 17801

Monday - Friday

7:30am to 4:00pm

MAPCO Machine Shop

Go Faster. Go Farther. Go With MAPCO.

Filling Your Automotive Machining Needs Since the 1980s


Our parent company, Mertz Auto Parts Company, started over 50 years ago in Sunbury, PA, with a partnership between two cousins, Robert “Bob” and Richard “Dick” Mertz. Within several years a third partner, Roy “Check” Adams, was brought into the business. Over the years, the business evolved into two separate divisions—our used truck parts salvage yard and the addition of our machine shop, MAPCO.
We have been selling quality parts to our customers at our salvage yard for years. Our inventory focuses on hard-to-find parts but changes rapidly. Our salvage yard has many different manufacturers and configurations of trucks.
In the late 80’s, we purchased a local machine shop for engine machining services. We moved the business to its present location and expanded the services over the years to include driveshaft assembly, u-bolt bending, and hydraulic hose assembly. An engine dyno machine was also added at our present location.
In 2015, we sadly lost the two original partners, Bob and Dick Mertz. Their passing prompted a change in ownership in 2016 to long-time partner, Roy Adams, and his wife, Patsy Adams. With the help of our hard-working and dedicated employees, the business continues to move forward.
As Roy and Patsy look to the future, their business goal is to continue serving their customers salvage parts and machine shop needs. They greatly appreciate their customers for their decades of support of a local, small business.


Proud Dealers of:

Parker Hose & Fittings

Allstar Performance Parts

What makes our services unique?

Custom. Custom. Custom.

Every event, every driver, and every machine is different. Each piece fits into its own place in the puzzle to work together to create a unique driving experience. When you need your vehicle to perform at a higher level, stock parts often will not fit into that puzzle. That’s why our work is custom tailored to fit you, your vehicle, and your application. We pride ourselves in providing one-of-a-kind engine builds, driveline work, and hydraulic hoses. Every customer is unique to us and their job is treated as a completely custom, one-off build.

King of the Hammers Engine

We like it Fast & Loud. Do you?

If you're ready to have your vehicle performing at it's best contact us today.