The following is our procedure for reconditioning cylinder heads:
- Heads are disassembled and thoroughly cleaned
- All valves, springs, keepers, and retainers are cleaned separately
- Spring pressure is checked by a mechanical tester against OEM specifications
Valves
- Wear checked by micrometer
- Warp checked
- Margin checked
- Stem end refaced
- Valve Face precision ground
- Overall length equalized
Cylinder Head
- Surface straightness checked
- Magnetic particle or pressure tested
- Guides checked for wear
- Seats checked and precision cut to proper width and angle
- Studs checked for damage and proper heights
- Precision resurfaced
- Cleaned again prior to reassembly
Assembly
- Valve stem heights checked and set
- Assembled to OEM specifications
- Mechanical check for leakage on valves and seats
Other Services Performed
- Crack Repair
- Valve Seats Installed
- Spring Pocket Enlarging
- Overhead Cam Align Boring
- Helicoils Installed
- Studs Removed/Installed
- Spring Heights/ Pressures Set
- Aluminum Head Heat Straightening
- Valve Guides Installed
- Resurfacing
- Porting and Polishing
- Install Larger Valves