My 200ci block was rebuilt about 70,000 miles ago and I think they never decked the block. I've always had a small weep at the gasket where the head meets the engine block. This is my daily driver and I've got tomorrow and the next few days to fix a leaky head gasket. I think I nicked the gasket a year ago when I rebuilt the cyl head. I'm think I'm losing coolant into the engine. Can the block be decked while in the car?