I think you need a trip to Las Vegas but hey that's just me No fishing but plenty of fish to eat, some of the best restaurants in the world here.

Sorry for the plug now back to your regularly scheduled post

Oh yeah there is a TON of flex on a std size cam core at 900lbs..It is exponential from 600 to 900

A trip to LAS Vegas would be awesome, i am a gambler, but just small change.

Regarding deflection, a simple beam calculation would be easy to do, you just have take some measurements

Yes, flex is an issue. When rotated 720 degrees, the cam should be located in the same eccentric position as before. I was referring to the comment on the base circle dip (or "lash increase")as the engine is being turned over. You can see similar results with 300 pounds open, where flex is lees of a factor. Regards, Chase

Does some of the flex seen while rotating slowly - go away at RPM?

I wouldn't expect a camshaft to put up with millions of cycles of flexing like that if it were very much. But then again, I have no first hand experience to know any different either.

It gets worse. But what do I know?

Thank you for your reply. With the intake off of the engine today, I rotated the cam until the intake lobe was 180 degree from the lifter and checked the lash. Exactly .009 Then I rotated the engine until the exhaust valve was almost full lift and could see that the intake was still on the base circle (at this point I guess) and checked again. .029 Using a dial indicator I checked rocker shaft flex and found .006 ish . I indicated off of the cam between the lobes and found about .002 flex. Even taking the 1.7 ratio into consideration I still can't see where the extra lash is coming from.

Check this out. https://www.youtube.com/watch?v=nPmKzDF-RCE

Typical common shaft Dodge stuff. Been trying to tell ya Kinda why we don't run them(any common shaft set up)on serious stuff.

Also think some are way overthinking some of this. This is nothing new and is an issue with common shaft rocker set ups. Now try it with a set of Crane gold shafts

Better or worse?

I'm assuming worse.

From my experience worse

Why not set all intakes and then exhaust to a certain lift ( measuring with a dial gauge off retainer) and not worry about how much lash or flex you have. Getting a base measurement first of course. It would be interesting to see if there is a difference between them. Running would be a whole nuther ball game, getting a stable valve train at speed will never happen. IMO everyone is wasting air, like the pinion angle affair.

Are just assuming the cam companies have no idea about this valve train flex and do not account for it in the lash numbers? I would ASSume they know about, and they recommend what they do for a good reason.

Four guys at Comp sure didn't seem to know what I was talking about. I need someone to explain to me that increasing lash just before the valve opens is a good idea. All of the boasting that cam manufactures do about how awesome their lobe technology is and for what? To plop the valve open when all of the slack is taken up. No misery why racers are complaining about breaking B1 rockers all of the time. Might as well open the valve with an air hammer!

And increasing the lash before opening the valve might very well be intentional. If so great. But I will need some one to explain it to me very slowly.

I ran B1's for 13 years. Once everything was right, I didn't have anymore valve train issues. I'm not sure why you are having these issues, and to be honest, I never checked intake valve lash with the exhaust at high lift. I ran the single shaft T&D rockers, Koffel black rockers, and common shaft T&D rockers. Never broke a rocker. I also cycled them out after 500 or so runs. You might try calling a long time custom cam grinder like Ken Heard. He owns Oregon Cam, and has been grinding custom cams for me for the last few years.
www.oregoncamshaft.com

Thanks for the information. I will give him a call. We haven't broken a T&D rocker yet and I want to keep it that way.

I have never broken a B1 rocker either. Common shaft or paired shaft. Key is to use the right parts for the job. Most Mopar guys don't wanna spend the money to go fast and step up to better pieces for what they are trying to do. Then they wonder why someone's combo runs better than theirs does. Just my .02

Odd. Everyone I know that runs B1 heads (or other brands) complain about their rockers and carry spares. I will figure out the problem. I feel that the point has shifted to attacking the messenger and not the message. Thanks though