Page 1 of Lunati Crankshafts by Holley Performance Products, Inc.

cams lunati 4340 non twist steel crank forging lunati s big block and small block chevy crankshafts are forged from the finest 4340 aircraft quality certified steel the 4340 alloy steel meets aircraft cleanliness and purity standards our exclusive non-twist design allows for continuous granular flow producing a crankshaft with a higher cycle bending fatigue over the twisted forging version valve train design specifications the specifications during manufacturing are of the highest lunati standards for racing use it is necessary that we improve on factory standards we have done this with the material as well as the machining · · · · · all radii in the rod and main journals are .140 roundness of each journal is within .0001 or less micro finishing of the journals are a grade 5 rms or better crankshaft stroke is ±.001 maximum induction hardened 360º to depth of .055 for less bearing journal wear pistons oiling technology the oiling system is similar to gm s factory specification however we have developed more precise points where the oil enters the main and exits the rod journal this exacting entrance and exit point improves the oil film thickness available at the rod journal in addition all oil holes have special attention given to the design for proper oil delivery rods cranks the lunati contoured wing design lunati is proud to offer the contoured wing design counterweights on all of its pro series crankshafts the design of the leading edge of the counterweight is extremely important in directing the air and oil around the counterweights this design allows the air and oil to be directed to the main rather than the connecting rods therefore keeping the air and oil away from the rotating connecting rods air and oil move around the contour wing design without losing contact with the boundary layer if the air and oil lose contact with the boundary layer eddy currents will form costing valuable horsepower through windage engine kits competition s knife-edge counterweight directs oil onto swinging rods lunati contoured wing design counterweight directs oil away from swinging rods minimizing windage more horsepower apparel tech line 662-892-1500 275

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