We have been serving San Antonio and South Texas for the last 46 years, providing precision engine machine work and engine parts. Through excellent customer service and attention to detail our goal at Duffin Engine Service is to exceed your expectations.

Crankshafts

MAGNAFLUXING, GRINDING, STRAIGHTENING, THRUST REPAIR, MICRO-POLISHING.

Blocks

MAGNAFLUXING, CYLINDER BORING & HONING, DECK SURFACING, ALIGN BORING & ALIGN HONING, COUNTERBORES MACHINED,  UPPER & LOWER BORE SLEEVING, PRESSURE TESTING & CASTING REPAIRS.

Cleaning

VAT CLEANING CAST IRON & ALUMINUM, GLASS BEADING

Cylinder Heads

 THREE ANGLE VALVE JOBS, SURFACING, VALVE GUIDE REPLACEMENT & REPAIR, VALVE SEATS INSTALLED, PRESSURE TESTING & ALUMINUM HEAD WELDING (CASTING REPAIR)

Connecting Rods

MAGNAFLUXING, BIG END RECONDITIONING, REBUSH & PIN FIT SMALL ENDS.

Miscellaneous

FLYWHEEL GRINDING, ENGINE BALANCING, WELDING & BRAZING (STEEL & ALUMINUM), BROKEN BOLT REMOVAL & THREAD REPAIR, BROKEN TAP & EZ OUT REMOVAL

OUR TEAM

Our team consists of 10 with the combined experience of 168 years...

Myrt Duffin

office manager and co-owner

Call Myrt today to set up your next job!

Russell Duffin

machinist, manage and co-owner

Do you have questions about a project? Contact Russell!

Scotty

Machinist

Scotty is align boring a block

    Ross

    Machinist

    Ross is machining valve seats

      Jon

      Machinist

      Jon assembling a cylinder block

        Vic

        Machinist

        Vic polishing a camshaft

          Donald

          Machinist

          Donald is surfacing a flywheel

            Donald

            Machinist

            Donald is balancing a crankshaft!

              ABOUT

              About Duffin Engine

              We offer engine machine shop services for:
              • automotive engines
              • over the road diesel trucks engines
              • industrial engines
              • marine high performance and small engines
              Duffin Engine Service is committed to keeping current with the latest technologies, to accomplish this we are a member of the Automotive Engine Rebuilders Association (AERA). Located at 1227 Hallmark, three blocks inside Loop 410, near Airport Blvd.

              Contact Us

              • 1227 Hallmark Drive San Antonio, TX
              • Map Open Monday through Thursday 8:00 am to 5:00 pm. Friday 8:00 am to 3:00pm.

              TESTIMONIALS

              "Family owned and operated machine shop second to none."

              "Amazing, knowledgeable, and affordable work by an awesome team of people!"

              "They are always prompt and friendly with an incredible price point."

              CONTACT

              Leave your name and number and a message and we'll get back to you soon!