I ran them till about a month or two ago when the heli coils for the rocker shafts pulled out the head and snapped the shaft and destroyed my valve covers, never using bolts on shafts again lol.
The cnc heads were on a 408 w 11.5:1 and a solid roller(257/[email protected] .640/.645 not taking lash into account.), 904 w 4500 converter. Best run @6800ft DA was 11.8@113 (6500rpm shifts) all steel car, just missing the back seat.
Replaced them with trickflows. Direct swap @ 7900ft DA shifting at 5800-6000(low) and soft launch was [email protected]
And I street drove them alot.
The other stroker has ootb speedmasters that aren't cncd. With a basic 9.9:1 and a lunati hyd roller .560/.565 lift voodoo. They have been on it for a couple years now. No problems with them, best run when the engine was in the dart was 12.44@107 on a 6000ft DA.