I have an old Walker radiator for a 34 with a small-block Chevy. Bought it used several years ago and it's been sitting in storage. Looking for a shop to test it and repair if needed. In LA, Orange, Riverside, or San Bernardino Counties. Thanks
Fontana Radiator. They repaired several big truck flathead radiators for me. They also recored the heater core for my '54 Ranch Wagon. Very happy with the work. Fast turn around and fair prices. IMO Fontana Radiator | Heavy Equipment, Aluminum, Brass, Custom & Motorcycle Radiator Repair
There's Tom's Radiator on Chapman Ave in Orange. I haven't used them and don't have any experience with them, just passing along the location information in case it helps: https://www.tomsradiatororange.com/ I would call around to some diesel truck and heavy equipment shops near you and ask them who they use.
Don't know if he's doing any repairs anymore but does excellent work. Matson's Radiator/Fanman in Stanton.
VALLEY RADIATOR. (VAN NUYS) Been there for years and have done several of my vehicles and are reasonably prices. HIGHLY RECOMMENDED.
On the many times I have passed there I've seen any number of hotrods there being worked on on the outside lifts. Not an endorsement as such but it is very much an old school looking place. Chris