Actually hemi e-bodies had a smaller diameter, thicker booster. I've always seen black boosters on 70-71 cars, the later ones seem to have the cad-plated ones. thats not saying a 70-71 cannnot come with a cad-plated booster, I just don't ever remember seeing one. My hemicuda clone has a aftermarket booster similar to the original in shape and size (for hemicars)...it's for valve cover/spark plug clearance.
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