Forged 4340 AQ
Nitrided 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
• 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
• CNC profiled for accuracy and consistency

Part Number	Description	Stroke	Rod Length	Main	Pin
2C3480A17A4	SB350 2pc seal	3.480”	5.700”	2.448”	2.100”
2C3500A17A4	SB350 2pc seal	3.500”	5.700”	2.448”	2.100”
1C3750A17A4	SB350 2pc seal	3.750”	5.700”	2.448”	2.100”
3C3750A17A4	SB350 1pc seal	3.750”	5.700”	2.448”	2.100”
1C3750A17B4	SB350 2pc seal	3.750”	6.000”	2.448”	2.100”
1C3875A17B4	SB350 2pc seal	3.875”	6.000”	2.448”	2.100”
1C4000A17B4	SB350 2pc seal	4.000”	6.000”	2.448”	2.100”

Part Number	Description	Stroke	Rod Length	Main	Pin
1C3750B17A4	SB400 2pc seal	3.750”	5.700”	2.648”	2.100”
1C3750B17B4	SB400 2pc seal	3.750”	6.000”	2.648”	2.100”
1C3875B17B4	SB400 2pc seal	3.875”	6.000”	2.648”	2.100”
1C4000B17B4	SB400 2pc seal	4.000”	6.000”	2.648”	2.100”

Part Number	Description	Stroke	Rod Length	Main	Pin
5C4000C37D4	BB454 2pc seal	4.000”	6.135”	2.749”	2.200”
5C4250C37F4	BB454 2pc seal	4.250”	6.385”	2.749”	2.200”
5C4500C37G4	BB454 2pc seal	4.500”	6.535”	2.749”	2.200”
5C4750C37H4	BB454 2pc seal	4.750”	6.750”	2.749”	2.200”

Part Number	Description	Stroke	Rod Length	Main	Pin
4C4000J17C4	LS1 w/reluctor	4.000”	6.125”	2.559”	2.100”
4C4125J17C4	LS1 w/reluctor	4.125”	6.125”	2.559”	2.100”

Part Number	Description	Stroke	Rod Length	Main	Pin
BC3625E17C7	Ford 351W/SVO	3.625”	6.125”	2.750”	2.100”
BC3750E17C7	Ford 351W/SVO	3.750”	6.125”	2.750”	2.100”
BC4000E17J7	Ford 351W/SVO	4.000”	6.200”	2.750”	2.100”
BC4250E17Q7	Ford 351W/SVO	4.250”	6.250”	2.750”	2.100”