| MATERIAL AND LOCATION | SODIUM INTERNAL FILLING |
| STEEL, FED STD 66, AISI/SAE 8645 TIP |
| STEEL, FED STD 66, SAE EV3 HEAD |
| STEEL, FED STD 66, SAE EV3 STEM |
| STEEL, FED STD 66, SAE VF2 SEAT FACE |
| METALLIC HARDNESS RATING AND LOCATION | 30.0 ROCKWELL C MINIMUM HEAD |
| 40.0 ROCKWELL C MAXIMUM HEAD |
| 30.0 ROCKWELL C MINIMUM STEM |
| 40.0 ROCKWELL C MAXIMUM STEM |
| 65.0 SHORE SCLEROSCOPE MINIMUM TIP |
| HEAD STYLE | CONCAVE |
| HEAD HEIGHT | 0.2080 INCHES MINIMUM AND |
| 0.2180 INCHES MAXIMUM |
| OUTSIDE DIAMETER | 1.8950 INCHES MINIMUM AND |
| 1.9050 INCHES MAXIMUM |
| NECK RADIUS | 0.5000 INCHES NOMINAL |
| SEAT ANGLE IN DEG | 45.0 |
| STEM STYLE | GROOVED |
| GROOVE DIAMETER | 0.3740 INCHES MINIMUM AND |
| 0.3760 INCHES MAXIMUM |
| CHAMFER LENGTH | 0.0150 INCHES NOMINAL |
| GROOVE WIDTH | 0.3150 INCHES MINIMUM AND |
| 0.3250 INCHES MAXIMUM |
| STEM LENGTH | 5.3495 INCHES MINIMUM AND |
| 5.3735 INCHES MAXIMUM |
| STEM DIAMETER | 0.4337 INCHES MINIMUM AND |
| 0.4345 INCHES MAXIMUM |
| DISTANCE FROM GROOVE TO STEM END | 0.1710 INCHES NOMINAL |
| CHAMFER ANGLE IN DEG | 45.0 |
| CARBON RELIEF GROOVE | NOT INCLUDED |
| FSC APPLICATION DATA | GASOLINE ENGINE |