Cylinder Head

• Vat Head - The head is placed in our chemical spray cabinet until clean and then hand rinsed and dried. 
• Pressure Test - The cylinder head is installed in our pressure testing machine, where the coolant passages are filled with pressurized air and the head is sprayed with soapy water. And cracks in the coolant passages will cause the water to bubble.
• Resurface - The cylinder head is set up in our precision Berco surfacing machine, where the minimal amount of material is removed to give the sealing surface of the head an ultra flat face, and proper surface finish.
• Vacuum Test - The cylinder head is set up on our Serdi machine and each intake and exhaust ports has  a vacuum pulled on it to insure the valves are sealing. 
• Valve Job - The head is completely disassembled and cleaned in our chemical vat. The head then has all remaining carbon burned out of it, and the ports are blasted back to a like new condition. All mating surfaces are buffed to remove remaining gasket material. The head is then set up on our Serdi machine, where the valve seats are cut with a single multi angle bit. The valves are then reground and installed for vacuum testing. The head is then resurfaced (unless otherwise noted) and cleaned a final time. It then goes to our Sunnen assembly machine where the new stem seals and parts are installed.
• Port and Polish - Master porter David hand polishes each intake and exhaust runner to improved flow while retaining turbulence and velocity.
• Cut for Oversized Valves - The valve seats are opened up to the size of the oversized valves on our Serdi maching and cut with a high flowing, multi radius cutter bit.
• Valve Adjustment - On heads with solid lifters, the head is completely assembled with cams installed and checked for proper valve lash. Valves are machined accordingly until they are within factory specs.

• Vat Block - The block is placed in our chemical spray cabinet until clean and then hand rinsed and dried.
• Bore - The block is set up on our Rottler boring machine and bored within .003 of the final cylinder sized. This ensures the cylinder is straight and true again.
• Hone - The block is set up in our Rottle honing machine and finished to size. To create a platue finsish we use varius stone grits depending on the type of ring being used for assembly. The cylinders are also brushed to remove any fractured metal left in the cylinder. For high performance applications, a Torque Plate is installed in place of the cylinder head and torqued to spec. along with the main caps. This ensures that any distortion created by the head or main caps is simulated during the machining process.
• Deck - The block is set up in our precision Berco surfacing machine, where the minimal amount of material is removed to give the sealing surface of the head an ultra flat face, and proper surface finish.
• Align Hone - The block is put in our Sunnen Align Honing machine, where the caps are cut, torqued into place, and then machined to be straight and true. This also allows for better control in main bearing tolerances.
• Square Deck - The block is set up in our Berco surfacing machine. Using a BHJ fixture, the block is machined to be a perfect 90 degrees from deck to deck and perfectly centered between the cam and main journals. Material is removed until the measured deck height matches the calculated deck height.
• Balance Rotating Assembly - Each rod and piston is machined within a 1 gram tolerance. The cranks is then fitted with the appropriate bob weights and balanced on our Hines balancing machine.
• O-Ring Deck - An o-ring groove is machined in the deck around each cylinder and a steel o-ring is pressed in. The amount the o-ring comes out of the deck depends on the application.