About Us

In 1949 Harold Mulder Started his career as a machinist in Boise Idaho and in 1967 Harold opened “Mulder’s Auto Machine Shop”, in that same year his son, Steve Mulder, started working with him after school learning the trade inside and out, Then in 1971 after graduating from high school Steve Mulder came onboard as a full-time employee and shifted the business into high gear, Steve acquired the business from his father in 1984 and became the owner/manager of Mulder’s Auto Machine Inc.

Since 1967 Mulder’s Auto Machine Inc. has always remained the Boise valley’s top performance machine shop, while other shops continued to use sub-standard or antiquated equipment simply to cut costs, Mulder’s Auto Machine Inc. has constantly invested in the latest state of the art shop equipment and training, Mulder’s Auto Machine Inc. was built on a solid foundation of pride, workmanship and the attention to the smallest detail. Doing the job right the FIRST TIME and ON TIME has always been the catalyst to our continued success.

For  50 years Mulder’s Auto Machine Shop has been serving the Treasure Valley as a “FULL-TIME” professional machine shop, unlike other shops that use fuzzy-math and count “hobby and part-time” as actual work experience. Our long standing reputation for quality workmanship and honest fair pricing continues to be a benchmark for other area shops to strive for.

At Mulder’s Automotive Machine we will always continue to invest in the latest state-of-the-art equipment and technology to do the job right “the first time on time” which makes Mulder’s the undisputed “Top-Shop” in the entire Treasure Valley hands down.


We Offer:

  • Complete Automotive Machine Work
  • Subaru Boring & head work
  • 4, 6, 8, 10 & 12 cylinder engines
  • Factory Stock Engines
  • High Performance Engines
  • 4×4 off-Road
  • Heavy duty Trucks
  • Restoration/Antiques
  • ALL Racing Applications
  • Strokers
  • Recreational Vehicles
  • Boats
  • Motorcycles
  • Harley Davidson
  • Stock Parts
  • Performance Parts

Monday-Thursday  7:00-5:00
Lunch 11:30-12:30
Friday Winter 7:00-10:00

Call us at (208)344-9011
Fax 208-429-5736