Any Steel/SS Valve with 11/32” min valve stem. Max 2.08” Intake and 1.625” Exhaust. Any factory production head (installed as an assembly line option) that originally used a 5/16” stem diameter may keep that same diameter with the 2.08”/1.625” max head diameters listed. No titanium except for valve spring retainers & locks. Roller rocker permitted. Stock valve guide angle no relocating valve guides.

In addition for Street Stocks:

B. No dry sump systems. Oil system must be an internal pump wet sump style system and the oil must be stored in the oil pan (external pressure adjustment allowed). A single stage external belt driven oil pump may be used as long as the oil is drawn from the oil pan. No oil reservoir other than the oil pan attached to the engine allowed. No oil pressure accumulators allowed.