verbs

First off, I wanted to thank this board's sponsors for all the help they've given.

Nasty N8, AP Engineering, TEA, MTI, and LG have all been great help.

Well, here is my issue:


I have different preload on every lifter on every cylinder.....

Cylinder# Intake Preload/Exhaust Preload
1 .025/.046
3 .026/.047
5 .027/.048
7 .024/.049

2 .017/.032
4 .015/.033
6 .016/.034
8 .018/.035


I ended up ordering the Ford Shims in .015 and .030 sizes, but the problem I have is that my Yella Terras are attached on each cylinder, so for example, on cylinder 1 I can't use a .15 shim on the intake and a .30 shim on the exhaust because wouldn't that cause some sort of imbalance since they're connected?

LG suggested for example, using .30 shims on all the passenger side rockers, getting the preload to the following:

Cylinder# Intake Preload/Exhaust Preload

2 -.013/.002
4 -.015/.003
6 -.014/.004
8 -.012/.005

Then I would use lash caps on the top of the valve stems to get the preload back to where I'd like it to be since lash caps come in more sizes and offer more "adjustability" if you would.

Mr. B

iTrader: (1)

????

verbs

i goofed the copy paste

Mr. B

iTrader: (1)

Much better!

Country Boy

iTrader: (24)

Adjustable rockers are soooo much easier

verbs

Hindsight dear boy, hindsight

Country Boy

iTrader: (24)

Unaffliated Racing

iTrader: (15)

That's what I'm screaming!

If I were one of those shops listed I might have suggested.." hey why don't we set you up with a good set of Comp Pro Mag's"

66ImpalaLT1

Why is your head .010 shorter on the drivers side?

Brian Tooley Racing

iTrader: (13)

The only lash cap thinkness I know of is .060", you would have to grind them to yeild something different and would have to be done on something like a surface grinder to make sure they are flat. On another note, I believe factory lifters can be adjusted anywhere from a few thousandth's from the top of the plunger all the way to .015" from the bottom like LPE once reccommended. I contacted Comp and ask if there is any reason why these lifters can not be adjusted the same and the response I got was NO, meaning, the plunger can be put about anywhere in its travel just like a stock lifter and still works. I didn't shim my R at all with my Harland Sharp rockers, and never had a problem.

michael101

iTrader: (21)

You're saying that Comp told you the .002-.004 preload is not critical? Not that I'm suprised, but I'd sure like to hear more about that.

02bluess

iTrader: (18)

I'm so confused...

So far I've seen feedback ranging from one extreme (installed them just like stockers and no issues) to the other (make sure preload is set just right or you'll end up with lifter parts all over your engine).

Which is it??

verbs

Per Louis at LG, preload should be between .008 and .012, and not .002-.004.

LG runs their Comp R preload from .010-.020, and sometimes as high as .025. They say they've never had any problems running the comp R lifters like this. Running the preload on the comp R's below .010 will cause a lot of valvetrain noise too.

verbs

The Comp adjustable rockers only come in 1.75 and 1.85 ratios, and I think the lift with the G5X3 would be pushing it.


I have no clue? Either a difference in the placement of the valves by TEA or a poor job cleaning my heads off by the machine shop; my heads were a bit warped so they cleaned em off, but not .010

I was told they just took off a couple thousandths.

02bluess

iTrader: (18)

verbs,

I'm new to this whole preload game

Could you describe the method/tool(s) you used to measure your preload on each cylinder to such an accurate (thousandths) precision?

I will likely be needing to do the same thing very soon, and I want to make sure I do it right. Also, if a specialized tool was used, about how much did it cost and where'd be the best place to find one?

Pro Stock John

iTrader: (34)

I personally don't think that the lifter preload is that critical with the Comp R's as long as it's below something like .025.

What lash caps would you use? When I last used some it was 2000, and we had to take some and modify them (sort of ghetto).

Unaffliated Racing

iTrader: (15)

Here it is word for word out of the Comp catalog

Pro Magnum lifter must be installed on an engine
with ADJUSTABLE rocker arms and preloaded to
.002"-.004". Always set the preload with the engine warmed to
normal operating temperatures to allow for thermal growth


http://www.compcams.com/Technical/Ca...ML/279-282.asp

so..run them at whatever preload you like..but you run the risk..and dont call Comp to warrenty your lifters once they fail

verbs

I got completely different information from Louis at LG Motorsports, I'm hoping he'll chime in....

Unaffliated Racing

iTrader: (15)

well..I think I would trust the company that supplies the parts..wouldn't you?

verbs

I do agree, but then again, LG has been in this business for a long time, so I do trust them.