Hey Ford friends,

I'm installing 1.6 pedestal roller rockers on fresh heads, still stock cam. Using blotter (IE Ink on roller) and L.O.S. (line of sight). I don't have tools/environment to do full rang of lift blot or have dial gauge.

From what geometry i do remember, and the mentioned ref. article. here is what i know.

OPTIMAL ALIGNMENT =
Measurements at Zero and Max lift same, inside of center on Valve Stem. At mid lift measurement should be = to Zero/max only outside of center.

Reference measurements
Valve stem dia. .3408
theoretical lift @ 0 lash, INT: .4130" , EXH: .4420
pushrod to rocker center 7/8ths=.875 x 1.6 for 1.4

Shim measurement
Thick = .035"
Thin = .020"
2 thick shims seem to move VS contact point .035"

I did this drawing to help me get n idea of the variance from center on the VS the the roller contact would be.

http://i371.photobucket.com/albums/oo160/neistro/Mustangnmore067.jpg
Drawn at 2x scale  

Anyway what i came back with was,
total variance, INT .010", EXH .0151

Now my questions is
Split these #s again, which by non dial guage methods starts to look alot like Go for center then try to subtract via shims in thier known measurements.

Sorry people if i sound like im ramblin or this doesn't come across clearly.

First time poster and first time rocker arm swap.

Any input will be well received.

THanks again


Reference Article
http://www.eatonbalancing.com/blog/2007/12/10/rocker-arm-geometry/