You oughta rethink the 6v53. Detroit made an aluminum block upgrade kit for a military armored personel carrier. They were significantly lighter than the cast iron counter part. About a month ago there was an aluminum 6v53 block listed on ebay.
That, and if you had questions about the buildup, I think this fellow would be able to help...
Clicky
Paul
That, and if you had questions about the buildup, I think this fellow would be able to help...
Clicky
Paul