Lunati is proud to announce the availability of their big block Chevy Sledgehammer crankshafts.  Part number BO425IN with a 4.000” stroke and P/N BP425IN with a 4.250” stroke are designed for street and strip applications where Lunati quality and budget mindedness counts.

Sledgehammer cranks are forged from 4340 steel.  All pins arms and main bearing surfaces that are all standard big block Chevy size and width, no undersize.  Pin arms are drilled with lightening holes removing more inertia weight.  Lunati profiles the pin arms and chamfers the oil holes for consistent oiling and film retention.  All counterweights are clearanced for a 6.385” connecting rod.  Each crank is nitride hardened, receives a sonic cleaning, and finished off with a protective oil coating allowing direct installation right out of the box after balancing.

For more information contact LUNATI, 11126 Willow Ridge Drive, Olive Branch, MS 38654.  Telephone:  662-892-1500.  Or visit us on the web: www.lunaticamshafts.com Lunati is proud to announce the availability of their big block Chevy Sledgehammer crankshafts.  Part number BO425IN with a 4.000” stroke and P/N BP425IN with a 4.250” stroke are designed for street and strip applications where Lunati quality and budget mindedness counts.

Sledgehammer cranks are forged from 4340 steel.  All pins arms and main bearing surfaces that are all standard big block Chevy size and width, no undersize.  Pin arms are drilled with lightening holes removing more inertia weight.  Lunati profiles the pin arms and chamfers the oil holes for consistent oiling and film retention.  All counterweights are clearanced for a 6.385” connecting rod.  Each crank is nitride hardened, receives a sonic cleaning, and finished off with a protective oil coating allowing direct installation right out of the box after balancing.

For more information contact LUNATI, 11126 Willow Ridge Drive, Olive Branch, MS 38654.  Telephone:  662-892-1500.  Or visit us on the web: www.lunaticamshafts.com