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Last I knew there was a set on a Z-28 in a Tennessee muscle car museum, sliver car as I remember.
Boys,Yes, Im aware of the 'Semi-Hemi' or small block canted valve heads. I was curious IF Chevy had experimental or test mules with any sort of in house prototype power plants. As I remember from articles from 'back in the day' Chevy had some cover shots on Hot-Rod magazine with displays of DOHC, SOHC V-8 'what IF's' for any potential production?
Well I am sure Chevy had plenty of motors they were working on:https://www.hemmings.com/blog/2015/03/05/lost-and-found-overflow-chevrolets-overhead-camshaft-and-hemi-headed-big-block-v-8s/
Maybe Charlie will chime in but I am thinking he had an aluminum gm small block once that was something odd??
It started out as a bare unfinished block that came from GM engineering. The only machining done was the pan rails. All other machining had to get referenced from the rails. Took years to get it all machined as there weren't alot of places that could do that stuff back then.