Sold out 6564-C GX390 +.200 Stroker Crankshaft GX390 +.200 Stroker Crankshaft. 2.720"(69mm) stroke with standard crank pin diameter. Machined in house from hardened 4340 Chromoly to the exact standard you have come to expect from ARC. Dual plane... FBu1,388,350 Out of stock