can some one tell me the difference between the two ?

 

personaly the si Z6 is way better. Pulles good for stock v tec

 

The main difference is that the D16Z6 is OBD1 and D16Y8 OBD2

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kaiba &raquo;</TD></TR><TR><TD CLASS="quote">The main difference is that the D16Z6 is OBD1 and D16Y8 OBD2</TD></TR></TABLE>

That can make tuning much easier and more effective.

 

D16Z6
Found in:
1992-1995 Honda Civic EX/Si, Del Sol Si,
1992-1995 Honda Civic ESi (European Market)
Displacement : 1590 cm3
Bore and Stroke : 75 mm X 90 mm
Compression : 9.4:1
Power : 125 hp @ 6500 rpm & 106 ft·lbf @ 5200 rpm
VTEC Switchover 4800 rpm
Valvetrain : SOHC VTEC
Fuel Control : OBD-1 MPFI
Head Code : P08


D16Y8
Found in:
1996-2000 Honda Civic EX (USDM)
1996-1997 Honda del Sol Si
Displacement : 1590 cm3
Bore and Stroke : 75 mm X 90 mm
Compression : 9.6:1
Power : 127 hp @ 6600 rpm & 107 ft·lbf @ 5500 rpm
Valvetrain : SOHC VTEC
Head Code : P2J
Piston Code: P2P

 

Besides what's stated above,

The Y8 makes a wider powerband usually for whatever reason.

The Y8 has a larger and more sought after intake manifold.

My friend is looking for a Y8...he is not looking for a Z6. because he wants to pass emissions and sell his 97 ex coupe and his miata to buy a G35 coupe.

Some of the plugs are different.

The y8 has a knock sensor.

We threw a blown up Y8 from a parking garage 5 stories high. The Z6 i blew up got sold for $125.

Sift through the unnessacary garbage, and I actually have some good info in that post.