[DW31S]

IIRC, they were discussed in Hooper's book way back in 1990. Supposedly, the heads required a lot of other engine components to make the entire package function. Hardly stillborn, but not far from it. Other GM divisions had exotic stuff, too, and most of it also had a short (but expensive) life. Olds had Hemi-heads, aluminum blocks and other stuff that never saw production. Pontiac made some aluminum engines for Mickey Thompson and Chevy toyed with fuel injection on a few 409s. So, while the Hemi-head 302 is rare, what is more rare is that some of them got into private hands.