I doing my 408W swap now and I am using my existing Worlds Products Roush 200 heads. My question is do I have to gring the valves before I Put them on my new block? The bottoms have carbon deposited on the bottoms but do I need to take the valves out and grind them? Cant I just grind the bottoms of them and be fine? I was told I was crazy if I didnt take them out and grind them.
