Compstar Durastar features Spec 4340 material, multi heat-treated, double stress-relieved, deep nitride-hardened, large radii in all journals, keyed shear-proof timing gear fit, drilled rod journals, dual-keyed damper fit, accepts OEM post and flange bolts, accepts OEM flywheels/flexplates, machined flow, main bearing oil holes with lead-ins for enhanced cold start oil, precision ground and micro-polished to 6 Ra. Conservatively rated for 800 HP & 800 ft./lb. torque.
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:
- 1-piece
- Engine Stroke (in.):
- 3.898 in.
- Material:
- Forged 4340 steel
- Engine Balance:
- External
- Lightened:
- No
- Requires Narrow Bearings:
- Yes
- Rod Journal Diameter (in.):
- 2.477 in.
- Main Journal Diameter (in.):
- 3.146 in.
- Rod Length:
- N/A
- Crankshaft Snout Style:
- Standard
- Balancer Bolt Thread Size:
- M18-1.5
- Weight:
- 90 lbs.
- Quantity:
- Sold individually.
- Make:
- Chevrolet
- Engine Family:
- Chevy Duramax
