RH7 full hemisphere big valve racing heads

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Here's a couple photos of the Norton factory RH7 big valve racing heads. They're rare but they are still around. It takes a lot of dome to get high compression with these heads.

RH7 full hemisphere big valve racing heads

RH7 full hemisphere big valve racing heads
 
Are the Mark's inside the head, casting imperfections? Are they all like that?
 
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