| MATERIAL AND LOCATION | STEEL, FED STD 66, AISI/SAE 3140 OVERALL |
| METALLIC HARDNESS RATING AND LOCATION | 40.0 ROCKWELL C MINIMUM HEAD |
| 46.0 ROCKWELL C MAXIMUM HEAD |
| 40.0 ROCKWELL C MINIMUM STEM |
| 46.0 ROCKWELL C MAXIMUM STEM |
| 50.0 SHORE SCLEROSCOPE MINIMUM TIP |
| HEAD STYLE | CONCAVE |
| HEAD HEIGHT | 0.2100 INCHES MINIMUM AND |
| 0.2250 INCHES MAXIMUM |
| OUTSIDE DIAMETER | 1.9950 INCHES MINIMUM AND |
| 2.0050 INCHES MAXIMUM |
| NECK RADIUS | 0.4375 INCHES NOMINAL |
| SEAT ANGLE IN DEG | 45.0 |
| STEM STYLE | SLOTTED |
| CHAMFER LENGTH | 0.0312 INCHES NOMINAL |
| SLOT WIDTH | 0.1580 INCHES MINIMUM AND |
| 0.1620 INCHES MAXIMUM |
| SLOT LENGTH | 0.3300 INCHES MINIMUM AND |
| 0.3380 INCHES MAXIMUM |
| STEM LENGTH | 5.9687 INCHES NOMINAL |
| STEM DIAMETER | 0.3720 INCHES MINIMUM AND |
| 0.3730 INCHES MAXIMUM |
| DISTANCE FROM SLOT TO STEM END | 0.1940 INCHES NOMINAL |
| SLOT RADIUS | 0.0790 INCHES MINIMUM AND |
| 0.0810 INCHES MAXIMUM |
| CHAMFER ANGLE IN DEG | 45.0 |
| CARBON RELIEF GROOVE | NOT INCLUDED |
| FSC APPLICATION DATA | GASOLINE ENGINE |