ESP features SAE 4340 steel non-twist forging, multi-stage heat-treated, stress-relieved, 0.125" radii for use with narrowed bearings, chamfered oil holes, shot-peened, nitride hardened, X-rayed, magnafluxed, and sonic tested. Recommended for use up to 1500 HP. Lightweight has the same features as standard, with gun-drilled mains and light-weight counterweight design. Featherweight has the same features as standard with gun-drilled mains and ultra-light-weight counterweight design. Armor Finish (AF), Surface finishing process results in an incredibly slick surface with a chrome finish appearance
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.):
- 4.125 in.
- Material:
- Forged 4340 steel
- Engine Balance:
- Internal
- Lightened:
- No
- Requires Narrow Bearings:
- Yes
- Rod Journal Diameter (in.):
- 2.100 in.
- Main Journal Diameter (in.):
- 2.649 in.
- Rod Length:
- 6.000 in.
- Crankshaft Snout Style:
- Standard
- Balancer Bolt Thread Size:
- 7/16-20 in.
- Weight:
- 54 lbs.
- Quantity:
- Sold individually.
- Notes:
- 400 Mains
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen I
- Engine Sizes:
- 6.6L/400
- Years:
- 1970-1980
