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I have Keith Craft Stage 1 427 Edelbrock heads. I have a 4.25 bore so I went with the 2.19/1.73 valves. If I had to run smaller valves, I might have opted for more porting. I don't know about your bore size, I went with KC's recommendation. He is tough to get a hold of on the phone, but will talk as long as you want once you have him on the line.
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