Comp Cams 10-214-5 XE 212/218 Hyd Flat Camshaft for AMC 290-401XE 212 218 Hyd Flat Cam AMC 290 401 An older member of the COMP Cams grind family, the Magnum series of camshafts offers excellent performance gains over stock without the added wear and tear associated with more aggressive camshafts. Ideal for use with higher compression ratio engines that need to bleed off compression, the magnum series performs its best when static compression is 9. 5: 1+ and with an aftermarket higher stall torque converter.