New COVID 19 Pick up precautions, local pick up instructions will be given to anyone who plans to stop by in person, please call or message us 24 hours before to make an appointment.

We’re Open, rebuilding blown engines for all customers including Frontline workers and First Responders. Please note we are taking all precautions and Saftey measures so please call or message us before coming in person so we can make sure to keep our customers and ourselves safe.


a month ago
Honestly the short block I ordered was really well made and delivered pretty quickly, GCH was great at replying in a timely manner and answered all of my questions. The only thing that irked me was the dowel pins were not included/installed which for someone who isn't to mechanically inclined might give them a little bit of grief on installation. However that being said the break in went smoothly engine ran fine while following their suggested break in instructions. Once the block was tuned I never registered a knock even at 7k rpm under 20 PSI, so again their blocks are extremely well made and I will definitely be a return customer.
- J R
3 months ago
Ordered a Fa20 short block recently and have been super happy with the results! The staff was great with quick responses and were able to put me on the right track for my build. With the quality and price of their products you really can’t go wrong here!
- Christian B
2 months ago
As a respiratory therapist and being on the frontline, I want to say thank you to the guys at GCH Long Block Racing for still working and preparing engines during these difficult time. Without them I would not be to get back to work and help out the sick. You guys are the best and easy to communicate with everything from getting a quote to properly break in the engine. I would definitely come back to you guy if I ever need another engine
- Chris T

Custom Subaru Machine Shop

With more than 45 years of experience here at GCH we specialize in Subaru, we are not a facility, we are a 2nd & 3rd Generation Custom Machine Shop. We machine and build custom builds or stage up packages or just short blocks or just heads. We cater to each of our customers needs. High performance machining available in house. 

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  • (909) 212-3843


Get directions
152 San Lorenzo Street
Pomona, CA 91766
United States

Business Hours

Mon:9:00 AM – 6:00 PM
Tue:9:00 AM – 6:00 PM
Wed:9:00 AM – 6:00 PM
Thu:9:00 AM – 6:00 PM
Fri:9:00 AM – 6:00 PM
Sat:9:00 AM – 6:00 PM
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