Great quality and friendly service. Prices are fair but you get what you pay for- highly recommended

Junior is very courteous, honest and will work with you to satisfy the customer. I will recommend his shop. thank you

I was recently looking for a new machine shop in the area because my old machinist retired at the beginning of the year. After trying Primos machine shop I was very pleased with the machine work and customer service he provided. It's been a few months now and all the cylinder heads I've taken them have came out perfect every time. Definitely recommend read more

Primos Cylinder Head - Valve job - Auto Repair Near Me - Ontario, California

See all

Jr was amazing. He delivered my motor he offered to deliver my motor all the way to Corona California awesome service. I really don't know what to say besides I'm definitely be going back. I appreciate these guys haven't turned on yet but if you know where the motor started and where it is now, they got my 327 looking very pretty appreciate these guys 100% recommend great service read more

Junior, Kevin and their dad Israel run a great shop. They did a valve job and pressure tested our 1970 BMW 2002 cylinder head. Honed and decked our block, ground the crank and got us a new bearing set at a great price. This is my second time going to them for machining. They did a great valve job on my 4.0 liter Jeep Cherokee head just last year. Still running strong. read more

Primos Cylinder Head - Junior is a great machinist. Great work. Great pricing - Auto Repair Near Me - Ontario, California

I came in here to get my cylinder heads rebuild on my 2004 Ford Ranger. They offer very reasonable prices, are friendly and responsive. It only took them a few days to get my truck back and running great. Also, they offer warranty on their cylinder head rebuild and engine rebuilds which is great. If you're looking to get some work done I 100% recommend you check this place out. They do everything at this shop.I will definitely be coming back here to get other work done on my truck. Thanks JR. read more

Best shop to have your cylinder heads repaired I have been going to them for years good price. Great value and nice people complete family

Was quoted $5500 for an engine swap in my BMW. Paid in cash in full. Was told 5 days tops to install. Called back a week later and said needed another $2000 for different engine. Paid that. Install took 2 weeks while I paid rental car. Car was smoking when I picked it up. Drivetrain malfunction light kept appearing. Brought back for texting and they said it needed another engine although the other shop said was just PCV valve. Drove car smoking for 1 month embarrassed and getting pulled over. Was told new engine install would take 5 days. Rented another car. Install took almost 3 weeks rental car cost another $1000. Told me he would reimburse, he didn't. Picked up car and he said no lights on. Picked it up and all lights were on including check engine light and drivetrain malfunction lights. Needs tons more work. Also no AC now and he said I didn't pay for that. I will be suing them now. Please don't use read more

The best customer service and prices in this area. the work was amazing and turn around was fast. Went above and beyond form me 3rd head in a month. read more

I had a few broken studs removed from an exhaust manifold. The work was done quick and correct. (Great price too)I would recommend them to do any kind of work. I will be back. read more

I sent my cylinder head to Primos for resurface and pressure check. Best prices in town and same day service. Highly recommended.

wow cant believe how fast and well rebuild the cylinder head was done I definitely recommend this place great job in only 1 day very serious personal very professional great price and what I liked from this place is that they used newest machines thanks primo!!!!!!!!! read more

Primos did a lousy job on a cylinder head that I took to them for a full cylinder valve job.It didn't last to long when the the car started throwing blue smoke through the exhaust because they didn't install the valve stem seals right,And also overheating issues do to poor machining on the bottom of the head.I should of gone to Brothers (Auto Value) in Ontario also which I know is more money but better job. read more

these guys are the best i have been sending my cylinder heads to primo for years he is always very helpfull honest and very good prices on their quality work read more