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Compstar LS1 cranks are made of true 4340 material and Ion Nitrided. These crankshafts feature main journal gun drilling and rod journal lightening as standard features. Compstar LS1 Crankshaft Strokes from 3.625" to 4.250" are available with either 2.100" or 2.000" rod journals. Popular 4.000 inch stroke cranks will internally balance to 1750 gram bob weight without heavy metal. Each crankshaft is sold with your choice of early or late style reluctor wheel installed.