We have over 2,000 cylinder heads in stock ready to ship!

Contact Us : 1-877-676-8322

Hours : 8am to 5:00pm ET

Expert Cylinder Head Remanufacturing

Allied Motor Parts has over 150 years of experience of remanufacturing automotive and light truck cylinder heads. Within our 25,000sf plant located just south of Atlanta, we have a large selection of cylinder heads to cover most all makes and models. We also have custom building for any obsolete or late model cylinder head that you may have problems locating.

The machinists at Allied Motor Parts specialize in remanufacturing cylinder heads. They can offer most any cylinder head foreign or domestic at very competitive prices.

Every cylinder head goes through detailed cleaning, machining and expert reassembly before being thoroughly tested. All of our cylinder heads are assembled to OEM specifications or better to guarantee your satisfaction.

Quality Cylinder Head Processing

Our pride is your best insurance in receiving the quality you expect. All work is done on our premises and starts with a complete tear-down and thorough inspection of every head entering our shop. After a complete evaluation of all components, its on to our state-of-the-art, 3-Step thermal cleaning system and magnafluxing; followed by our unique pressure testing tank which checks for final hidden cracks and imperfections. At this point, the head enters the second stage of our high tech machine shop where ASE certified machinists and technicians handle the precision stages of restoration to ensure you of superior workmanship and quality every time. CBN resurfacing is performed to eliminate the possibility of head warpage. Valve seats are triple angle high performance cut. Each valve is machine dressed at the stem and face, conforming with OEM specs. All springs are tension tested, and worn rocker studs are replaced when necessary. In addition new freeze plugs, pollution plugs, valve keepers and valve seals are installed. The cylinder head is then vacuum tested to ensure proper seating of all valves. Specifications and technical updates are readily available with our AERA data program. This information is utilized during the remanufacturing process to ensure accuracy at all times. Only after a final inspection are heads stamped with an inspectors stamp, packed and shelf stored in our climate controlled inventory area. All this and more, linked with the courteous and friendly service you receive equals the pride put into the quality you deserve.

  • Over 2,000 available
  • All makes and models
  • Repair or exchange
  • Aluminum welding
  • Cast iron welding
  • CBN and PCD resurfacing
  • Crack repair
  • Triple angle valve work


Cylinder Head Rebuilding Process

1. Initial Inspection: As a unit comes to our shop we will give it an initial inspection to determine if there are any reasons the head should not proceed to the rebuilding process. This inspection can quickly catch problems such as cracks, casting damage and other situations that would halt the rebuilding procedure for that particular casting.

2. Teardown: Teardown is also important to the initial inspection process as the cylinder head is disassembled. You can determine other areas of potential damage to the casting. The parts and cylinder head are separated and go though different cleaning processes.

3. Cleaning Process: We use several different processes to clean cylinder heads. Cast Iron heads are cleaned in a thermal cleaning system. They are baked at 600 degrees to reduce and oils into an ash. They are then put in a steel shot machine to give them a nice brilliant finish. Aluminum heads are either baked at a lower temperature or put into a high pressure wash. Aluminum heads are also glass beaded to give them a brilliant finish also.

4. Head Inspection: After cleaning heads they are then pressure tested or magnaflux to determine any cracks. All bolt holes, valve seat, valve guides and other parts of the head is inspected for damage like broken bolts, broken taps, cracked guides or other damage. Straightness and cam bore wear is also checked.

5. Machining: All cylinder heads have guides installed to meet OE specifications. They are resurfaced to far exceed factory specifications on surface finish. 3 angle valve job is performed to achieve a valve seat runout of less than .001. Valves are ground to make a perfect seal between the valve and valve seat.

6. Assembly: All heads have new OE style valve guide seals installed. Springs are tested to insure proper seat pressures. Valve seat sealing is check with vacuum to insure an air tight fit between the valve and the valve seat. Lifters are bled and rebuilt to accomplish zero lash after startup of the engine. Cams are polished and clearances are check to meet OE oil clearances.

7. Final Inspection: Heads are visually inspected. All bolt holes, surface finish, lash, and all other areas are inspected to insure a quality cylinder head.