IIRC, they (GM) were only going to build 427 of the new all aluminum ZL-1's. Just the collector value alone would make it a plus. On the flip side, the GM aluminum BB's didn't appear to be all that tough- Right after they were released in '69, there were lots of valve train failure problems. Maybe they fixed the weak points in the new version.
( I'd still like to have one. Ol' Red would feel right at home!)
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