![Image](https://i.imgur.com/Jvt9120.jpg)
The shoulder on the LZ4 machine screw is ~0.4mm (0.016") too large for the LS7 rocker pivot. The LS7 rocker pivot hole will have to be opened up a bit to use the LZ4 rocker screw or maybe LS7 rocker screws are the the proper length and shoulder diameter.
LS7 1.8:1 rocker on left, LZ4 1.7:1 rocker in middle, LZ4 rocker screw on right
![Image](https://i.imgur.com/oGu1V0F.jpg)
LS7 1.8:1 rocker is slightly longer but seems to share the same distance from pivot center to push rod. More measurements later.
![Image](https://i.imgur.com/hsHLoUd.jpg)
LS7 rocker above with LZ4 screw. Screw stops where shoulder meets rocker pivot.
![Image](https://i.imgur.com/HEppQs0.jpg)
LS7 rocker on LZ4 rocker pedestal and using LZ4 screw before any mods to LS7 rocker. The contact area of the LS7 rocker to the valve stem is slightly off center of the valve stem when the valve is fully closed.
More pics to come after removing valve spring and checking the full range of motion.
GM
GEN III / GEN IV V-8
LS1/LS2/LS6 1997/2007 HARDWARE
http://www.billavista.com/tech/pdf_inde ... nsions.pdf