factory magnum head replacement options
I bought a pair of Chinese heads from the same source "318 will run" did. Vega Parts and Cores. The pros? My machine shop said the guides/clearances were correct, the valve job great and quality of components very good. I had them cut down the valve guide for clearance to accommodate a higher lift cam. The cons? The ports as cast/delivered do not have the dimension and clean shape that the design intends. I remedied this by a common sense port job- the goal being restore the proper shape and have nice clean contours and surface finishes. Obviously- the bottom pic is the as delivered condition.
I bought a pair of Chinese heads from the same source "318 will run" did. Vega Parts and Cores. The pros? My machine shop said the guides/clearances were correct, the valve job great and quality of components very good. I had them cut down the valve guide for clearance to accommodate a higher lift cam. The cons? The ports as cast/delivered do not have the dimension and clean shape that the design intends. I remedied this by a common sense port job- the goal being restore the proper shape and have nice clean contours and surface finishes. Obviously- the bottom pic is the as delivered condition.