valve train pushrod geometry setting, weird question... maybe not Options

[orange914]

following the step by step valve geometry i've got a few possible issues? when no shims used and exhaust and intake geometry is set the swivel feet are almost bottomed out (almost no adjustment left). so next it was shimmed with .025, the geo/swivel tightness got better (not so close to bottoming against swivel) when shimmed with .040 shims i have more space to adjust up left before swivel contacts rocker (3/4 to 1 turn).

bottom line it seems to work out better with .040 shims. with no shims it has wider range of measurements between each valve -and- closer swivel foot to rocker arms.

1] is .040 shim o.k.?

2] if o.k. is 3/4 to 1 turn until swivel foot hits the bottom of the (modified) rocker acceptable? yes they are o.e.m. swivels from a 2.7

3] if not o.k. can i remove .030 or ? more from rocker arm

4] if none of the above is good what am i needing to do to correct this?

mike

[toon1]

Why would it be bad to deck the arm a little more instead of adding more shim? Is shimming just easier then decking? I can't see how a .070 deck would provide less structure then a .060 deck.

But I am a noob, and am watching this thread like a hawk (cause I am going to need to do it soon).

Zach

you can deck the rocker a bit and add more shim if it's necassary.

In this case, we just wanted to be sure 3/4 of a turn was enough clearance, and it looks like it is.

[orange914]

if i understand jake correctly, he was saying 3/4 of 1 mm is PLENTY because if the valve ever stretches that much, it'll snapp off long before you bottom out your adjustment ...
(IMG:style_emoticons/default/idea.gif) Andy

(IMG:style_emoticons/default/thumb3d.gif) 10/4... thats what i pulled from jakes post also, but need to confirm... is 3/8 to 1/2 turn (no shims) aceptable (plenty) and perferred???... jake??? (IMG:style_emoticons/default/poke.gif)

In this case, we just wanted to be sure 3/4 of a turn was enough clearance, and it looks like it is.

i guess unless we hear negatives on the .040 shims, that this is the prefered setting. even though these heads were L.N. prepared (and beautiful masterpeice at that) (IMG:style_emoticons/default/smilie_pokal.gif) , i would think that the possibility of the seats recessing over time could be a factor to go .040 shims???

mike