Compstar features Spec 4340 material, mid-weight design, multi heat-treated, double stress-relieved, properly placed counterweights nitride hardened, profiled for piston clearance, drilled rod journals, precision ground and micro-polished to 5Ra. Compstar Comet features triple heat-treated 4340 steel, gun-drilled main line, lightened rod journals, pendulum-cut counter-weights, and a star flange, precision ground and micro-polished to 5Ra. Magnum features ultra-pure AISI 4340 steel, triple heat-treated, nitride hardened, gun-drilled main line, full profiled counterweights, precision ground and micro-polished to 5Ra.
Proposition 65 Warning:
This product may contain chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
- Rear Main Seal Style:
- 2-piece
- Engine Stroke (in.):
- 4.000 in.
- Material:
- Forged 4340 steel
- Engine Balance:
- Internal
- Lightened:
- Yes
- Requires Narrow Bearings:
- Yes
- Rod Journal Diameter (in.):
- 2.100 in.
- Main Journal Diameter (in.):
- 2.648 in.
- Rod Length:
- 6.000 in.
- Crankshaft Snout Style:
- Standard
- Balancer Bolt Thread Size:
- N/A
- Weight:
- N/A
- Quantity:
- Sold individually.
- Notes:
- 400 Mains
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen I
- Flywheel/Flexplate Attachment:
- 6-bolt
