What is the best casting 283 220 horse heads?

[Robert Simpson]

My father and I have always used the 520's the T castings to us seem a little better, thicker perhaps. The 896's are also good heads but they are a open chamber that needs to be angle milled to get to the cc's required for a 265/283/327. Hope this helps, if you are looking for some 520's we have some castings.