Re: Bowtie main caps
The block you have its a late model sportsman CNC block. The sportmans class didn't allow steel caps so they built these heavy duty nodular ironcaps. It has the extra webbing in the front for the 4 bolt main front cap. These nodular caps are much larger than the steel caps. I run them on mine with no issues. You would not break them unless you really, really really detonated it big time. At that point you would have other issues even with steel caps. You would be better off keeping them as they are a perfect fit and the chance for cap walk in replacement caps is greater. I studed mine and left them alone.
John