Cylinder Head Resurfacing in Riverside, CA
A cylinder head that isn't perfectly flat won't seal — and that leads to coolant leaks, overheating, and blown head gaskets. At Diego's Machine Shop, we resurface cylinder heads on our surface machine so the mating surface is flat and true, letting the head gasket seal the way it should. With over 20 years of experience, we machine heads for cars, diesel engines, and motorcycles, for both repair shops and car owners. Free estimate on every job.
What Is Cylinder Head Resurfacing?
Cylinder head resurfacing (also called "surfacing" or running the head on a surface machine) is the process of machining a thin, precise amount of material off the head's mating surface to make it perfectly flat. Over time — especially after overheating — heads can warp. A warped head can't seal against the block, no matter how good the gasket is. Resurfacing restores a flat, clean surface so the new head gasket seals correctly and the engine holds compression, coolant, and oil where they belong.
Why a Flat Head Surface Matters
When the head sits flat against the block, the gasket can do its job. When it's warped or rough, you get problems:
Resurfacing fixes the root cause so the repair lasts — instead of replacing the gasket on a surface that will just fail again.
Signs You May Need Your Head Resurfaced
Heads We Machine
We resurface a wide range of cylinder heads. We can also pair resurfacing with a valve job and full machine work when the head needs more than just a flat surface.
Our Resurfacing Process
Cylinder Head Resurfacing for Repair Shops
Need heads surfaced for a customer's job? We're a reliable machining partner for repair shops across Riverside and the Inland Empire. Drop off your heads and we'll return them flat, clean, and ready to install — accurate work at fair shop pricing. Call us to talk details.
Call to talk shop pricingFrequently Asked Questions
What does cylinder head resurfacing do?+
It machines the head's mating surface perfectly flat so the head gasket seals correctly — preventing leaks, overheating, and repeat gasket failures.
How do I know if my cylinder head needs resurfacing?+
Common signs are overheating, a blown head gasket, white exhaust smoke, coolant loss, or milky oil. We measure the head for warping and tell you honestly whether it needs surfacing.
Can a warped head be saved, or do I need a new one?+
Many warped heads can be saved by resurfacing, as long as they're within limits and free of cracks. We inspect and measure yours and give you an honest recommendation.
Do you resurface aluminum and cast iron heads?+
Yes — we machine both, for cars, diesel engines, and motorcycles.
Do you do valve jobs too?+
Yes. When a head needs more than a flat surface, we can handle valve work as part of our engine machining services.
Do you offer free estimates?+
Yes — every job starts with a free estimate.
Get a Free Estimate Today
Ready to get your engine back in shape? Call us, send a message, or stop by the shop in Riverside. Every job starts with a free, honest estimate.
Sat 8:00 AM – 2:00 PM · Sun Closed