If you have a big bird, and need to add REAL weight here is a good way to do it...Instead of laying it in a cowl and epoxy glassing it.. mount two big bolts through the firewall minimum 1/4 by 20 thread (depending on the amount of weight). Then hang your weight out as far as you can on the bolts..run the bolts through the lead...without interfering with the cowl or motor..double nut it and locktite ...its a good way to go when you are adding pounds not ounces....