| MATERIAL AND LOCATION | STEEL, FED STD 66, SAE HNV4 OVERALL |
| METALLIC HARDNESS RATING AND LOCATION | 40.0 ROCKWELL C MINIMUM OVERALL |
| 45.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | FLAT |
| HEAD HEIGHT | 0.1340 INCHES MINIMUM AND |
| 0.1540 INCHES MAXIMUM |
| OUTSIDE DIAMETER | 1.6900 INCHES MINIMUM AND |
| 1.7000 INCHES MAXIMUM |
| NECK RADIUS | 0.2500 INCHES NOMINAL |
| SEAT ANGLE IN DEG | 44.0 |
| STEM STYLE | GROOVED |
| GROOVE DIAMETER | 0.2980 INCHES MINIMUM AND |
| 0.30430 INCHES MAXIMUM |
| CHAMFER LENGTH | 0.0100 INCHES NOMINAL |
| GROOVE WIDTH | 0.0950 INCHES MINIMUM AND |
| 0.1050 INCHES MAXIMUM |
| STEM LENGTH | 3.8870 INCHES MINIMUM AND |
| 3.9230 INCHES MAXIMUM |
| STEM DIAMETER | 0.3412 INCHES MINIMUM AND |
| 0.3422 INCHES MAXIMUM |
| DISTANCE FROM GROOVE TO STEM END | 0.2295 INCHES MINIMUM AND |
| 0.2505 INCHES MAXIMUM |
| CHAMFER ANGLE IN DEG | 45.0 |
| CARBON RELIEF GROOVE | NOT INCLUDED |
| FSC APPLICATION DATA | GASOLINE ENGINE |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 28839 |
| DESIGN CONTROL REFERENCE | 531608 |