Holly or Thermoquad

Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,600-5,800
Intake Duration at 050 inch Lift 224
Exhaust Duration at 050 inch Lift 230
Duration at 050 inch Lift 224 int./230 exh.
Advertised Intake Duration 268
Advertised Exhaust Duration 280
Advertised Duration 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.477 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.480 in.

T-Q has the smaller of the two primary sizes the # on the base plate i dont know off the top of my head but it starts with a 9***