. There is absolutely nothing wrong with aluminum blocks, having run both the original cast iron side oiler vs., aluminum I can say that steering is lighter and overall weight balance is greatly improved with Aluminum. Push Rods: I assume using aluminum was a joke, because I could barely package 3/8 steel and had to machine the manifold at that to get them in. I am not familiar with any of the after market iron blocks but hopefully they have an improved
oil delivery system like the new aluminum blocks