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January 2025 by Herve Boissonnault
Bext experience I have ever had with a machine shop. They have amazing skills.quality one and done work.
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December 2024 by Braedyn Luiz
Nothing but good things to say. Great guy, great work and very fair pricing. I will always make the extra drive to go to J&M
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September 2024 by Steven
I have nothing but good things to say about my experience working with J&M for the first time. Clearly extremely knowledgeable machinists who stand by their work. I will absolutely continue to use them for all my machining needs!
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September 2024 by Justin G
I would highly recommend J&M Machine co to anyone. I am currently rebuilding the engine on my Ford 2N tractor. I brought the components to John after issues with a prior shop. I am extremely happy with how everything has come out, and feel like i have been setup for success on the build. John’s recommendations and guidance has been instrumental. The block needed a lot of work, and my crank had been ruined by the previous shop - but with Johns help things are back on track. Got a new crank, block was rebored for over sized sleeves and new valve seats were installed. Everything came out excellent, and its great knowing taking the time to do things right now will pay dividends later. Thanks John!
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July 2024 by J.R B
I've been a loyal customer of John at J&M Machine for years, even driving two hours to deliver customer parts to him, especially because their service was exceptional. However, my recent experience was disappointing. I entrusted them with rebuilding a 2020 Cummins engine, equipped with aftermarket internals. I provided high-end parts and emphasized to John the engine's high horsepower and compound turbos. Yet, after they struggled to find certain parts, I found myself driving a total of eight hours to provide items they could have located with some research.
Moreover, after reinstalling the engine in the truck, with less than an hour run time, we heard a knocking sound, which we initially mistook for "fuel knock," unaware that it could be related to the machine work. After pulling and cutting open the oil filter to find a enormous amount of metal from just 45 min of run time and hours of diagnostic work revealed that JM had not taken the time to properly measure any specifications for the engine's assembly. John spoke with a representative from the engine parts manufacturer, who confirmed that they had no record of the settings used, resulting in the new pistons scoring the cylinder walls and thus ruining everything that had been done, including thousands of dollar's worth of parts.
After noting this, John and I discussed the matter. John informed me that the rings were not "file fit," hence no clearance adjustments were made. How could an engine builder neglect to ensure this is correct? John, with your experience of building hundreds of engines, especially of this caliber and horsepower rating, it's inconceivable that you wouldn't check this. And then to tell me there's no warranty, holding us responsible for the parts that were damaged in less than an hour of running time? Then to proceed to say "welllll you didn't tell me" Why should a customer be responsible for relaying that type of stuff to you? You are providing the service... not the customer... Go ahead and say we are at fault for not providing information to you, maybe if you were organized and wrote things down perhaps the outcome would be different. I specified the power rating and the fact it had a aftermarket turbo set up, plenty of times.
Thousands of dollars spent, hundreds of customers referred, and yet you can't stand behind your own mistakes. Your "no warranty" policy should not cover poor craftsmanship and lack of responsibility. Perhaps it's a deficiency in understanding and skill regarding modern engines?
All I know is that you've lost a very loyal customer. Every one of these reviews pertains to a 1930 engine you rebuilt that can tolerate being three-thousandths off specification. To prevent this, all you needed to do was make it right, not let me leave your shop upset, with thousands of dollars in parts tossed into a bucket.
Edit - Your response is irrelevant and speaks it self to your professionalism; if you took the time to make sure the specifications were correct by reading the email below I'm sure we wouldn't be in this scenario. Bonus - we had to replace the block it self as all cylinder walls were scored, and 5/6 pistons were completely destroyed. OH - lets not forget about the rounded crank main cap bolt, perhaps wrong size socket?
- J.R
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June 2024 by Patrick Ryan
Excellent service, friendly and very knowledgeable! Highly recommend
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May 2024 by Jeremiah deOliveira
I recently had my L28 rebuilt by J & M Machine for my 1978 Datsun 280z, and I couldn’t be happier with the results! They were incredibly friendly, patient, and professional throughout the entire process. They demonstrated a deep knowledge and expertise in their work, ensuring that everything was done to the highest standard. I highly recommend J & M Machine to anyone looking for top-notch service for their engine rebuilds. A truly exceptional experience!
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March 2024 by Isabel Teresa Delgado Rodriguez
Excellent job done to my Subaru heads, very knowledgeable and helpful
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February 2024 by William Casarsa
John built me a short block for a higher hp turbo Miata almost 2 years ago. Right off the bat he took the time to discuss my goals and was honest about what would be needed. This was the first motor build I have been a part of and John took the time to answer all of the questions that I had. He was very timely with his work and sent me pictures and updates as he went which were very nice to have. I ended up being the reason for delay as I ordered numerous incorrect parts including “brand new” head that John inspected and informed me was in fact not new at all. His communication was top notch and to this day I have not worked with anyone as up front and transparent as J&M. He was very patient with me and I was so impressed with his investment in the project-it felt as if he cared as much as I did. The motor has been running strong for the past year and I cannot thank and recommend this shop enough. Hope you’re doing well!
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January 2024 by James l Liegakos
Very professional john and Mike gave me an education on my flathead free of charge.
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January 2024 by J-Perk's Automotive LLC
Great work
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November 2023 by Tim Judd
John is the most attentive automotive machinist I have ever personally met. It is refreshing to find someone passionate about their craft in this area. Thank you John!
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September 2023 by Joe Goodwin
John really is an expert in his field. He not only takes the time to get the job done right, but takes time to understand your engine building goals and make sure you understand the important details. Reasonable prices and turn around time. If you want it done right, and to learn a few things along the way, John is your man.
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July 2023 by Tom
Did a fantastic Job replacing the valves in the heads of my Honda accord v6 Manual trans. Engine runs beautifully now. Dropped the heads off in the morning and he had them done for me by the end of the day. Very fast serviceSuper nice guy and has a ton of knowledge. Plus the shop is filled with all sorts of cool stuff. Can’t wait to do more business here.Tom @ Universal Auto Repair and SalesService: Engine repair
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March 2023 by Micah Kargela
I had great results and experience getting a cylinder head machined here! Reasonable price and great help/advice. Very professional
