F23a1 engine is used in Accord LX, EX 4 cycls. 150 hp, 148 tq.
it is vtec, but sohc for fuel effency purpose, not all VTEC makes big number powers.
I am sure K20's(civic SI, RSX-S) and K24s(CR-V, TSX) have much more power rating, yet has almost same fuel effencecy.

it's a whole different setup of VTEC from B and H serise motors, rather then making more power.
it controls the valves for maxim gas saving.