[NHRASuperStock455SD]

Chris I will call you and I will surely investigate this. Let me do some research before calling you. One thing I do need to clarify. If you look at the spark plug location in the picture below off the Dart website, this was what I was talking about for our plug location. My observation from your picture was that you had the plug exiting at the apex of the casting divide whereby incoming fuel charge would not be shielded. (I know it was a very small picture.) Could you explain further?

Here is the link: http://www.dartheads.com/products/cy...num-heads.html