hi, the only drawback, is you have to select the head gasket and it's the one you will use always. also, the mains have to be torqued with hone plate for correct results!! usually small blocks pull .001 -.003 depending on casting. another thing, don't torque at 95 #, use 85 # with moly lube, has less distortion and same clamping power. after the plate is torqued, the block needs to set for 12-24 hours to settle at final shape, then hone it. just food for thought. just bolting them on then hone right away gives very poor results.