.. are you talking split valve spring retainers or locks ? PICS please...
I never saw the rotators on any other head than the D2DE Mav' 250. I have A 170 D0DE-6090A , 250 D6DE , 200 - D5DE but have not seen or maybe noticed there to be exhaust rotators.
Current road ripping Maverick 250 with Vortech SC has stock cam D2DE 250 head with
unmilled block/cyl surface , back-cut valves, 302 springs, machining for viton seals, milled exh surface, ARP head bolts. Comp. chambers remain @ 62 cc's - with '@.045 gskt yields useful SCR for forced induction. (@ 8:1).
Preparing 200 or 250 small six project revisiting previous
draw-through Turbo adapted from Buick 231 V6 . Considering 'turbo' profile hyd. cam but not much head work other than back-cut valves and higher spring rates. Also investigating 1.6 rockers but 'turbo' cam already is higher ramp/ lift. ,,, Also deciding which head: the D0DE 54 cc or 62cc D2DE. The 62 chambers without milling yield @ 8:1 SCR and 54cc @ 8.5:1.
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have fun