OK, I looked it up for you. I must be feeling VERY generous today.
D16Z6
VTEC
Found in
1992–1995 Honda Civic Si
1992–1995 Honda Civic EX, EX-V
1992–1995 Honda Civic ESi (European Market)
1993–1995 Honda Del Sol Si (US)
1993–1995 Honda Del Sol ESi (European)
Displacement : 1,590 cc (97 cu in)
Bore and Stroke : 75 mm × 90 mm (3.0 in × 3.5 in)
Rod Length : 137 mm
Rod Ratio : 1.52~
Compression : 9.2:1
Power : 125 bhp (93.2 kW, 127 PS) at 6,600 rpm
Torque : 106 ft·lb (14.7 kg/m, 144 Nm) at 5,200 rpm
Volumetric Efficiency : 87.68%
Redline : 7,200 rpm
Fuel Cut : 7,411 rpm
VTEC Switchover : 4,800 rpm
Fuel Control : OBD-1 MPFI
Head Code : P08
ECU Code : P28
127hp at 6600rpm. It already has the biggest valves it can use. To go bigger would require it to be bored out to get a benefit rather than a drop in airflow.