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    JMS Racing Engines

    4.3 (23 reviews)
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    Services - JMS Racing Engines

    Auto maintenance

    Auto repairs

    Auto engine repair

    1 More Service

    Routine automotive maintenance

    JMS Racing Engines Photos

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    Richard A.

    My compression was low on cylinders 2 & 3 and I wanted to install a turbo kit on my 1999 Mazda Miata. I thought to myself, well it's either a rebuild or swap. Crunched the numbers and a rebuild made more sense. I followed youtube academy to pull the head off, I took the head to JMS Racing Engines, and I let them have their way with my engine for about 2 or 3 weeks. They identified that the compression issue was bad valves/seals. They machined the head surface and installed new valve seals and gave me a brief "how to install without breaking it" guide when I picked it up. Look at that before and after. It's so damn sexy. I can't wait to show it off at the next car meet (JK nobody can see it but ME okay! OKAY!) HAH.. no, but jokes aside, I'm very happy with the work from JMS Racing Engines. It was a couple hundred more than I expected to pay but the job was done so damn well I cant even complain. Pay the pros to do it for you. Worth it in my opinion. I regret pulling the block to get the pistons done too. Head rebuild was a success. Thank you my dudes!

    AMC 401 427ci stroker 525hp/585tq

    Great guys, great engines, stand by their work and support racers. They built me an awesome AMC motor that absolutely rips

    The damage

    Just picked up our engine, and they repaired and uogrades for our 72 nova. Was able to salvage the block, but unfortunately, our crank was toast. They were able to squeeze our engine in and get it fixed with some upgrades parts. Overall, I am happy with the services and looking forward to breaking it in on the engine dyno soon.

    Hands down one of the best machine shops around! Built a full small block 350 Chevy for my truck project. Couldn't be happier with the craftsmanship and quality that came out of this motor. It's had no issues period since getting it from this shop. Will be using them in the future, no questions asked!

    AA D.

    Great service, awesome parts selection, what more could I ask for? They were able to help out with all the engine mods, engine parts, and engine rebuild questions and concerns I had. Special thanks to Jeff and Mike!

    Anthony M.

    I have nothing but good things to say about JMS and Mike. They have been one of the best referrals I could have ever been given. the workmanship is amazing!!! Customer service is amazing completion time is amazing. Will now pass the word on for other who are looking for top quality workmanship for machine needs. Thank you Mike and JMS once again see you soon!!!!!! highly recommend!!!!!

    JMS racing engines 401 Nailhead.

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    17 days ago

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    6 months ago

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    4 months ago

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    5 years ago

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    2 years ago

    Best machine shop around SoCal. They machine and dyno themselves. They machined and assembled my 468 for my jet boat .

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    2 years ago

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    3 years ago

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    5 years ago

    Best engine shop around. Mike, Jeff and all the guys at JMS went above and beyond to help me out.

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    9 years ago

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    11 years ago

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    15 years ago

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    10 years ago

    Business owner information

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    Jeff J.

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    7 years ago

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    4 years ago

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    8 years ago

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    Jeff J.

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    12 years ago

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    13 years ago

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    8 years ago

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    15 years ago

    Professional and great engine work. Very good communications and will will give you value for your money. .

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    Ask the Community - JMS Racing Engines

    Review Highlights - JMS Racing Engines

    Mike delivered the engine to my home ( at no additional cost ) and treated me well through out the entire process!

    Mentioned in 8 reviews

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    RTMotorworks - Alignment done for this brand new Juniper

    RTMotorworks

    (321 reviews)

    I was in need of getting new brake pads and rotors for my 2020 BMW X5. Was getting quotes from a…read morecouple of other places but getting the quote from RTMotorworks was thorough. I was hoping I just needed brake pads for the front and hopefully not all 4 wheels at the time. They were very responsive and the quote was comparable to other places, if not better. Decided to take it in on a Friday in the morning. Checked my wheels and told me I just needed the front brake pads and rotors replaced. The back was still good. Sigh of relief somewhat. They were able to get the pads and rotors replaced for little under 3 hours. Time went by and they were updating me during the whole time. Great service and team here. Will definitely bring my car back in to get other services done. No issues whatsoever with the new pads and rotors.

    PROBLEM: ALIGNMENT ISSUES, CUSTOMER SERVICE, ACCOUNTABILITY…read more When I first tried to leave a review, my account was somehow blocked from posting specifically for RTM, while I could still review other businesses. I contacted Yelp, and by coincidence, the representative I spoke with was also RTM's Yelp rep. He said it was strange that I couldn't post only for RTM. After I explained my situation, he advised me not to leave a review and instead take the matter to small claims court--which I did. During the hearing, the judge seemed to understand my side, but the ruling ultimately favored RTM. Despite being advised not to post this, I'm sharing my experience here because the situation still doesn't sit right with me--especially given Yelp's controversial review practices. On 10/1/25, my rear right adjustable control arm snapped. My car has aftermarket wheels, tires, and suspension components, so a precise alignment is critical to ensure proper fitment without rubbing the fender. I initially went to TM Auto (located across from RTM) for the control arm replacement. After installation, TM took my car to RTM for alignment. I specifically asked them to match the rear right alignment to the rear left, which was set at -2.8 degrees. When I went to pick up my car, I immediately noticed the rear right wheel did not match the rear left. The camber was visibly off. I pointed this out to the technician, but he insisted the alignment was correct and that there were no machine or human errors. After repeated requests, they put the car back on the rack, but instead of rechecking, two additional technicians came out and dismissed my concerns with questionable explanations: "Toyota made the fenders uneven." "Your control arm is made in Taiwan/China--what do you expect?" Despite putting the car back on the rack, they never rechecked the alignment. They simply removed the car and stood by their original claim. With no resolution, I had no choice but to drive the car home. Because the alignment was incorrect, my tires rubbed against the fender the entire way. The next day, I found heat damage, paint cracking, and visible wear on the fender. I came back the next day to talk to Richard (the owner) hoping he would recheck everything, but it was apparent he was "too busy"--despite clearly having time to talk with other customers and then continue working on another car, while ignoring me. I waited outside RTM for over an hour trying to speak with him. When the TM Auto manager asked if he had seen the damage, his response was, "Yeah, so what?"--with no concern at all. After is when I left, and was forced to go to another shop to realign--more driving, more damage done. I used a camber gauge and measured -2.8 degrees on the rear left and -2.0 degrees on the rear right. To confirm, I took the car to my trusted shop, Chewerks in La Habra, where they verified the rear right camber was indeed -2.0 degrees and did not match the left side. Their measurements matched mine exactly. Because RTM refused to recheck or correct their work, this improper alignment caused damage to my car. The rear left side tucks properly, while the rear right sticks out about half an inch, which led directly to the rubbing and damage. I had clear documentation and evidence, but the court still ruled in RTM's favor. I chose not to appeal to avoid spending more time on the matter. A nearby body shop, Cenco Auto Body, quoted over $1,800 to repair the fender (with another shop giving a similar estimate), confirming the extent of the damage. What could have been a simple recheck turned into a costly mistake. Despite everything, RTM did not offer any compensation or attempt to make things right. Seeing RTM's highly rated Yelp profile made their response even more surprising. They're quick to take your money with a smile when things go well, but when issues arise--as in my case--they deny responsibility and make no effort to make things right (In my case, they didn't take money directly, but a receipt was given to TM Auto, and I had to pay TM Auto--which is the same as paying RTM directly). TM Auto went as far as offering RTM to help cover the repair costs, but RTM still refused. TM Auto didn't have to step in for someone else's mistake, yet they still tried--that says everything. Richard (the owner) had my contact information through the small claims process, yet he never made any effort to contact me--even before we went to assigned court date. After what happened, I'm relieved I didn't bring my other cars first--especially since those cars are of higher value. It seems RTM has many satisfied customers, along with a smaller number of unhappy ones. Hopefully, you don't end up in the latter group like me. FWIW: Following the incident, I contacted Hunter to verify when RTM's rack was last calibrated. Abel (rep) advised that its calibration was set to expire later that month. This raises the possibility that their rack may have been out of calibration.

    Expeditious Auto Repair - Hours as of 3/2023

    Expeditious Auto Repair

    (64 reviews)

    I normally go to several spots for most of my cars work. But Sunday it's very scarce to find anyone…read morewho does work. I thank God Almighty to find me this place! The staff is very cordial and professional with superb customer service and their lobby waiting room is awesome very clean and they got an arcade section for you and the kiddos to play to pass the time. If that's not your thing you have very comfortable seating available while you wait. They have drinking water and cups if you are thirsty. Bathroom is available as well if needed. Today they did my routine trans drain and refill as well as trans filter replacement, first time at this location as it was in dire need. The price is very reasonable. They also pointed out a lot of other issues my car needed to address at a later time. They got me in and out in no time and I was able to get some other quotes on more jobs my vehicle needs. I will be back soon thanks guys for the awesome quality, value and work! Please contribute to this establishment and give them your business. Dependable, Reliable, Trustworthy service!

    I've been coming to expeditious for years now and I can say without any doubt there is no better a…read morerepair shop. David is extremely hospitable and gives great pricing. He's got a great operation and terrific team. While getting your car done there is a dedicated commons room stocked with drinks and retro arcade games, it's a great way to pass the time.

    JMS Racing Engines - autorepair - Updated May 2026

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