This 4 3/8" bore piston series is for cylinder heads designed for use with a flat topped piston in S&S® engines for 1984–up big twins.
| 92-4990 Series Pistons Specs |
| Type |
Bore |
Material |
Dome |
Deck Height |
Stroke |
Wristpin Diameter |
| Forged |
4 3⁄8" |
Low Silicon |
Flat |
1.200" |
All |
.927" |
Standard. . . .92-4990
+.010". . . .92-4991A
+.020". . . .92-4922A
