Forged 4340 AQ
Induction Hardened Crankshafts

produces the of
crankshafts from E4340 AQ forgings made in the
USA and machined in Jackson, MI.

The Competition Series crankshafts feature:

• Oil holes that intersect shallow oil hole pockets in the main bearings to help maximize bearing surface on the mains and improve oil flow to the rods
• Induction Hardened to a minimum depth of 0.060”
• 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
• CNC profiled for accuracy and consistency

Part Number	Description	Stroke	Rod Length	Main	Pin
2C3480A11A4	SB350 2pc seal	3.480”	5.700”	2.448”	2.100”
2C3500A11A4	SB350 2pc seal	3.500”	5.700”	2.448”	2.100”
1C3750A11A4	SB350 2pc seal	3.750”	5.700”	2.448”	2.100”
3C3750A11A4	SB350 1pc seal	3.750”	5.700”	2.448”	2.100”
1C3750A11B4	SB350 2pc seal	3.750”	6.000”	2.448”	2.100”
1C3875A11B4	SB350 2pc seal	3.875”	6.000”	2.448”	2.100”
1C4000A11B4	SB350 2pc seal	4.000”	6.000”	2.448”	2.100”

Part Number	Description	Stroke	Rod Length	Main	Pin
1C3750B11A4	SB400 2pc seal	3.750”	5.700”	2.648”	2.100”
1C3750B11B4	SB400 2pc seal	3.750”	6.000”	2.648”	2.100”
1C3875B11B4	SB400 2pc seal	3.875”	6.000”	2.648”	2.100”
1C4000B11B4	SB400 2pc seal	4.000”	6.000”	2.648”	2.100”

Part Number	Description	Stroke	Rod Length	Main	Pin
5C4000C31D4	BB454 2pc seal	4.000”	6.135”	2.749”	2.200”
5C4250C31F4	BB454 2pc seal	4.250”	6.385”	2.749”	2.200”
5C4500C31G4	BB454 2pc seal	4.500”	6.535”	2.749”	2.200”
5C4750C31H4	BB454 2pc seal	4.750”	6.750”	2.749”	2.200”

Part Number	Description	Stroke	Rod Length	Main	Pin
4C4000J11C4	LS1 w/reluctor	4.000”	6.125”	2.559”	2.100”
4C4125J11C4	LS1 w/reluctor	4.125”	6.125”	2.559”	2.100”

Part Number	Description	Stroke	Rod Length	Main	Pin
BC3625E11C7	Ford 351W/SVO	3.625”	6.125”	2.750”	2.100”
BC3750E11C7	Ford 351W/SVO	3.750”	6.125”	2.750”	2.100”
BC4000E11J7	Ford 351W/SVO	4.000”	6.200”	2.750”	2.100”
BC4250E11Q7	Ford 351W/SVO	4.250”	6.250”	2.750”	2.100”