Ok somebody or vader.....gimmie the run down on valvetrain geometry. I have my new canfield headed lunati solid cammed 350 up and running, and my neighbor says my geometry is wrong. He says its wrong because when we pulled a rocker off to inspect the mark the roller made on teh valve tip the etched mark on the tip was not centered...........is that correct? So the mark needs to be centered on the valve stem tip? Mine was a little "up" towards the intake.........so that would mean I need slightly longer valves then? What effect does this have on overall performance........reliability.....ect....?? Thanx

 

well i'm not vader so you can't really beleive much of what i have to say, but if it were me i'd leave the valves alone and increase the push rod length. hell i might even try one of them new fangled length checking push rods and actually see what i need. i ithnk you can find pics and a good description in a comp or lunati catalog, or web site. i'd also run this all past mr. vader just to make sure i didn't steer you the wrong way.

 

Use The Force, ede. Use The Force.

 

well if you read close enough I said SOMEBODY OR vader smartass. I just know for a fact he wrote something earlier on geometry and thought he could be helpfull if he caught sight of it. jeez. And I meant to say pushrod length not valves, I put my own motor together I'm not that stupid

 

Anytime someone (i.e. you) addresses a thread with someone's name in the title, it's rude.

If Vader's answer is the one you seek, use the force.
(AKA the button, or the button.)

 

its rude??? I just thought it would grab his attention. lighten up guys

 

This is correct.
since it's close, your pushrods are probably just a little short. A pushrod length checker is the tool you need to measure what lentght pushrods you need - then swap 'em out. If one of those lifters compresses a little too much in a high rpm blast then you'd probably be looking at damaged valves and/or valve guides.

 

Yea, I agree... I don't see anything wrong with throwing out a question to everyone, but putting someone specific's name in to get their attention. Whats the problem? He didn't say he ONLY wanted Vader's answer... just wanted Vader's attention.

 

have the mark in the center of the valve is a crud way of setting pushrod length. It will work but isn't the greatest way to do it.

 

Care to explain in more detail what the better way is?

 

 

i use Jim Miller's mid-lift theory. Its very difficult to explain and wasn't very widely known since he had a patent on his theory and no big time company could use it. However his patent has recently expired and some of the companies are starting to copy his design.

Crower's new rockers look like his and also the new comp cam shaft rocker system was designed on his mid lift geometry theory. I am too lazy to scan his theory and directions on how to set it up onto the computer. Here is a good link that describes the mid lift theory:
http://www.compcams.com/information/...RockerSystems/

read the brochure they have up there....just realize that they just didn't magically think of this. Miller just had it patented and they couldn't use it