Cylinder heads are where the magic happens in an engine. Air and fuel come in, combustion happens, exhaust goes out. When the heads are worn, cracked, or just not flowing enough for what you’re trying to do, the whole engine suffers — low power, overheating, misfires, coolant loss, or all of the above.
Remanufactured cylinder heads give you a rebuilt head with new valves, guides, seats, and springs — for a fraction of the cost of buying brand new. Here’s what you need to know.
What Does “Remanufactured” Mean for Cylinder Heads?
A remanufactured cylinder head has been completely disassembled, cleaned, inspected, machined, and rebuilt with new wear components. The process typically includes:
- Cleaning: Hot tank or thermal cleaning to remove all carbon, oil, and gasket material
- Crack checking: Magnaflux (iron) or pressure testing (aluminum) to find any cracks in the casting
- Valve guide replacement or reconditioning: Worn guides are replaced or knurled to restore proper valve-to-guide clearance
- Valve seat cutting: Multi-angle valve job for proper seating and airflow
- New valves: Intake and exhaust valves replaced with new
- New valve springs, retainers, and keepers: Everything in the valvetrain that wears gets swapped
- Surface milling: The deck surface is machined flat for proper head gasket sealing
- Assembly and testing: Complete head assembled, spring installed heights checked, and valve sealing verified
The result is a cylinder head that performs like new — proper valve sealing, correct spring pressure, true deck surface, and no cracks.
Complete Cylinder Heads vs. Bare Heads
When you’re shopping, you’ll see two options:
Complete Cylinder Head (Assembled)
Comes fully assembled with valves, springs, retainers, keepers, and seals installed. Bolt it on and go.
Best for: Most replacement jobs. You save the time and hassle of sourcing and assembling all the valvetrain components yourself.
Bare Cylinder Head
The casting only — no valves, springs, or valvetrain. You supply and install everything.
Best for: Performance builders who want to use specific aftermarket valves, springs, and retainers that match their cam and RPM targets.
Price difference: A bare head runs 30–50% less than a complete head, but by the time you buy valves, springs, retainers, seals, and keepers separately, the total cost is similar or higher. Buy bare only if you have specific parts in mind.
No Core Charge: What It Means
Some sellers advertise “rebuilt cylinder head, no core charge.” This means you don’t have to send your old heads back — no core deposit, no return shipping hassle.
Why does this matter? A core charge is typically $50–$150 per head, refunded when you ship your old heads back. That means boxing up 25–50 lbs of iron or aluminum, arranging freight, and waiting for the refund. No-core-charge sellers bake the cost into their pricing so you don’t deal with any of it.
Trade-off: No-core prices may be slightly higher upfront, but the total cost (factoring in return shipping) often works out similarly — and you skip the logistics headache.
Common GM Remanufactured Cylinder Heads
How Much Do Remanufactured Cylinder Heads Cost?
Most engines use two heads, so double these prices for a complete set. Even at the high end, a pair of remanufactured heads is a fraction of what new aftermarket or OEM heads cost.
Compare to new:
- New GM Vortec heads: $400–$600 each
- New aftermarket aluminum SBC heads (AFR, Trick Flow): $800–$1,500+ each
- New LS3 heads: $700–$1,000 each
When to Replace Your Cylinder Heads
- Cracked casting: Coolant leak into the combustion chamber or oil galley. No repair — replace the head.
- Warped deck surface: From overheating. Can sometimes be machined flat, but if it’s warped beyond the spec limit, it needs replacement.
- Burned or damaged valves: Persistent misfire on one cylinder, compression test shows low numbers, and the cause is a valve that won’t seal.
- Worn valve guides: Excessive oil consumption, blue smoke on deceleration, oil fouled spark plugs.
- Performance upgrade: Stock heads limiting airflow? Upgraded heads with better ports, larger valves, and proper spring pressures wake up any engine. Planning a build from scratch? Start with our bare blocks guide.
Head Gasket Tip
When you install remanufactured heads, always use new head gaskets and new head bolts (or properly inspected torque-to-yield bolts). Reusing old head gaskets or stretched bolts is asking for a blown head gasket — and that means pulling the heads all over again.
On LS engines, head bolts are torque-to-yield and are designed for one-time use. Don’t reuse them. ARP head studs are a popular upgrade if you want reusable, stronger fasteners.
Where to Buy
Bishop Car Parts carries remanufactured cylinder heads for GM applications — SBC, LS, and more. Complete heads with valves and springs installed, ready to bolt on. Direct-to-consumer pricing, no middleman.
