Warranty:1 Years OE NO.:customzied Size:4.000" 4.125" Application:for GM Chevrolet LS LS1 4.125" 4.000'' Stroker Crankshaft Item name:for GM Chevrolet LS LS1 4.125" 4.000'' Stroker Crankshaft Material:4340 Steel Casting iron Heat treatment:Tempering Nitrsepower:Max 1000hp