These heads were on a challenger for around 10,000 miles. I bought them but never got around to installing them.
They will fit 09+ 5.7 hemi engines and others as well.
This is a list from Thiteks site of what the have had done.
Bronze Valve Guides
Ductile Iron Valve Seats
Machined and hardened locks and locators
PSI 1511 Beehive valve springs
Single Radius Groove 7 degree Locks
Solid Stem SS Intake & Exhaust Valves
Titanium Beehive Retainer
Viton Valve Seals
Any questions just ask.