Originally Posted by gmoran1469
You don't have an aluminum block? Aren't all 05+ GT's aluminum blocks?
The OE equipment on 05-10 were aluminum block, but he has a built block. the cobra block and "boss block" are cast iron 4.6L engines. Since about 2011 if you wanted to start with a brand new block, your only choice was a cast iron 4.6L (unless you bought from a company that had stockpiled new aluminum blocks).