There would be 20 oe more Chevy guys to every Mopar guy, it's a crowded market
Yes, but there is also 20 more cylinder head options for each one of those Chevy guys.
How many offerings for the Mopar crowd from AFR ? . Zero, How many from Dart?. Zero, How many from Profiler ?. Zero.. etc.etc.
See my point ?
Because fewer people are buying them, why would these companies throw money away to develop, manufacture and offer them? They'll sell 100 pairs of LS heads to a pair of Mopar heads.
How many different brands of what are essentially the same outdated design of head do you need?