from skelly:
Okay, here we go. Most measurements are rounded off to the nearest 0.005" because of observed difference between same parts as well as inconsistencies in surface textures resulting in variable readings. I don't have any reference as to OEM specifications, but I expect you'll find these to be pretty darn close except in the case of the inadvertent type-o:
intake - exhaust - measurement
1.705 - 1.830 - valve spring uncompressed height
1.160 - 1.045 - valve spring O.D.
0.800 - 0.750 - valve spring I.D.
0.230 - 0.230 - valve stem dia.
0.175 - 0.175 - valve stem dia. @ clip (jargon?)
1.258 - 1.085 - valve face O.D.
3.745 - 3.745 - valve overall len.
1.110 - 1.000 - spring seat/shim O.D. (jargon?)
0.610 - 0.700 - spring seat/shim I.D.
0.018 - 0.018 - spring seat/shim thickness
0.350 - 0.350 - spring retainer lower I.D. (Note 1)
0.390 - 0.390 - spring retainer upper I.D.
1.113 - 0.985 - spring retainer O.D.
0.320 - 0.335 - spring retainer overall height
1.295 - 1.180 - Lifter O.D.
1.235 - 1.115 - Lifter O.D. @ oiler (Note 2)
1.215 - 1.100 - Lifter I.D.
0.400 - 0.400 - Lifter center pin contact surface O.D.
1.025 - 0.945 - Lifter overall height
Notes:
1. The retainer's I.D. is tapered to use spring pressure to increase pressure on the clips
2. The lifter has a groove in the outer edge. This is the diameter of this recessed groove.
pictures: ZE exhaust on the left and intake on the right
HLA
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_HLA.jpg)
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_HLA1.jpg)
RETAINERS
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_retainer1.jpg)
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_retainer.jpg)
VALVE
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_valve1.jpg)
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_valve.jpg)
VALVE SPRINGS
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_valve_spring.jpg)
![Image](http://img.photobucket.com/albums/v311/babybluemx3/ZEex_vs_ZEin_valve_spring1.jpg)
<small>[ November 22, 2004, 12:23 PM: Message edited by: babyblueMX3 ]</small>[/img]