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October 2025 by C Richards
I had Dons machine and prep a 318 block, crank, and heads. They told me it was was 4 weeks out. Which they were more or less accurate on. After I picked up all pieces, I began assembling the motor. The motor was about 90% complete(rotating assembly in, heads on, cam in) I went to drop the lifters into the bores. The intake bore on cylinder 1 would not take a lifter. I called Don's and they said to try and take some 5000 grit sandpaper through the bore. That also did not work. So after all that work the motor had to be completely torn down so that the block could go back to Don's. I dropped it off at Don's and a few hours later they said it was done. They said they checked every bore and they all worked good. Come to find out the same bore was still not good. I took it back AGAIN and they insisted that the bore was fine. After getting a few more opinions I was told that the bore would not work. I ended up taking the block to a different shop that is taking care of the issue. The shop also noticed a few other things that weren't done to a high standard. Not only have I spent weeks trying to get this sorted out, but I've had to replace the brand new head gaskets that I torqued down. I also had to replace the brand new rear main seal. Overall I didn't have the best experience.
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October 2025 by jaime de la rosa
Make sure when you drop off your part, you pick it up from the same person you drop off so your price doesn’t change. I paid more than what I was quoted when I dropped off by picking up my part from someone else.
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September 2025 by Mark Mac
Quilty that surpass any machine shop in the bay area : family's pride in what they do best , shop cleanest with out FM . IF ONE NEEDS IT DONE RITE 1ST TAKE PRIDE IN EVERY ASPECT. I'M LOOKING FOR THE BEST DON'S 👌 I'VE TESTED EVERY MACHINE SHOP'S IN BAY AREA TWO TOP SHOP'S DON'S IN MARTINEZ ,AND AL HUBBARD'S VICK VH
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July 2025 by eevan hhowe
Had a cylinder head machined here a couple months ago, They did a fantastic job and even cleaned it and pressure tested it too. Looked brand new when i went to pick it up
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April 2025 by Randy Seufert
Always there when I need something done. Great people
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January 2025 by Ivan Guzenko
Great machine shop. Currently in the process of rebuilding differentials on my jeep yj. Needed to make set up bearings for making adjustments to the gear mesh. Dons machine shop set me right up, pressing on my bearings for me and making me a set-up race for the pinion bearing. Also have my engine block there for a bore and hone. Great work love these guys.
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November 2024 by justina haberman
They fixed the crack in my rim and for a decent price
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October 2024 by JR Family
I live out of town about 3 hours away and was looking for a good machine shop to do all my work on a 2003 honda s2000. Decided to take it to dons machine shop to fully build my motor with darton sleeves. They absolutely killed it, everything had perfect clearance down to the pistons rings. Everyting worked as it should and compression was perfect. Not to mention the great customer service they have. Definitely going back for my kseries and all my honda motors.
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May 2024 by Tristan Press
Quick and affordable service getting wheel bearing pressed in. Will return for future needs.
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May 2024 by Lulu_ From_leschwab
Oh where’s do I start. Took 7 months to complete the job when I was told it would take 3. I got my engine back with parts repainted without my permission In terrible condition. All the hardware on the engine was stripped of the factory zink coating and was starting to rust instantly. Machine shop lost the rest of the hardware they didn’t use so I had to go find new hardware.best part is after installing and tuning of the engine. It didn’t last more than 50 miles before leaking oil between the head and block and knocking. So a year later and thousands of dollars down the drain it’s time I send the engine to a shop that knows what they are doing.
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February 2024 by Justin F.
I took my RB26 head in to get resurfaced and they took off 10 tho and ended up damaging my head to were it went past the fire ring. They took responsibility for it after i pointed it out with no push back. Then they had it tig welded and resurfaced again and took another 10 tho off. I picked it up and didnt think about checking the cam journals or saddles, what ever you would call them. The reason i didnt think about checking that side is because that wasnt the side i had work done to. Fast forward like 2 months i finally got around to working on my head again and found extensive damage to my journals/saddles. I dont want to take it back to them because they will probably damage it to the point of no return if it isnt already there yet.... Horrible quality. I will never go back to this business again.
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January 2024 by Robert Madison
Don's is great place and brad is awesome to work with
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January 2024 by jennifer stanley
They did a great job repairing my rim. They got it done quickly.
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January 2024 by Norm Kramer
Experienced, friendly staff. Good quality work.
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December 2023 by Alex O
If you're not in a rush but looking for the best workmanship. This is your place for overhaul engine parts.
