Forged 4340
Nitrided
Crankshafts
 produces the  of
crankshafts
from 4340 forgings
and polishes, nitrides and inspects it in Michigan.
The  crankshafts feature:
- Straight through oil holes similar to OEM
- Nitrided to a minimum depth of 0.012"
- Lightening holes in all four rods to reduce rotational weight and
reduce or
eliminate the need for heavy metal to balance
- Two step polishing process for the rod and main journal surfaces
- Held to tighter than OEM specifications
- Ideal for the racer that wants to upgrade from a casting
 |
Part Number |
Description |
Stroke |
Rod Length |
Main |
Pin |
1B3480A17A1 |
SB350 2pc seal |
3.480” |
5.700” |
2.448” |
2.100” |
1B3500A17A1 |
SB350 2pc seal |
3.500” |
5.700” |
2.448” |
2.100” |
1B3750A17A1 |
SB350 2pc seal |
3.750” |
5.700” |
2.448” |
2.100” |
3B3750A17A1 |
SB350 1pc seal |
3.750” |
5.700” |
2.448” |
2.100” |
1B3750A17B1 |
SB350 2pc seal |
3.750” |
6.000” |
2.448” |
2.100” |
1B3875A17B1 |
SB350 2pc seal |
3.875” |
6.000” |
2.448” |
2.100” |
1B4000A17B1 |
SB350 2pc seal |
4.000” |
6.000” |
2.448” |
2.100” |
 |
Part Number |
Description |
Stroke |
Rod Length |
Main |
Pin |
1B3750B17A1 |
SB400 2pc seal |
3.750” |
5.700” |
2.648” |
2.100” |
1B3750B17B1 |
SB400 2pc seal |
3.750” |
6.000” |
2.648” |
2.100” |
1B3875B17B1 |
SB400 2pc seal |
3.875” |
6.000” |
2.648” |
2.100” |
1B4000B17B1 |
SB400 2pc seal |
4.000” |
6.000” |
2.648” |
2.100” |
|
