shipping bigger parts ??

For smaller but heavy things like heads, did you try wrapping them one at a time and going USPS Parcel Post (now they call it Standard Post). If you do it this way, it can be surprisingly cheap (compared to other ways, still not super cheap). While shipping is what it is, my advice is to always try multiple options, not just carriers, but different ways of shipping the same thing. There really can be a heck of a difference, and I think sometimes people don't realize that and are paying too much for shipping (sometimes).