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While many people will say they are door stops, I'll say the other side of the story.
They are one of the best flowing smogger heads, and in reality, you're hard pressed to get anything better at a decent price. (and if they are bolt on ready to go...40 bucks is a good price)
I have personally had mine up to 260 or so degrees and have never had a problem. (don't you hate throwing fan belts on the freeway?)
The attachment shows how to tell a thin casting from a heavy casting.
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