How would you take the flex from a hollow cam?

[Torquey]

I have been modifying a Ford 4.6L dohc (modular) motor for about a year now. After close study, I conclude that the stock cams cannot withstand the added stress of after market (high pressure) springs. Reason? Hollow cams.

For the mod motor, Ford perfected a method of setting cam lobes on a hollow tube by pushing a steel ball down the center. All Ford modular cams are hollow. All after market modular cams are solid. By clamping down a small amount of resistant cam friction and hand turning the crank, I have watched these cams flex enough to gall the bearings. So, gentlemen, here is my question...

What would be an effective method to stiffen up these hollow cams? Here are some wild ideas:
1) Pour lead down the center.
2) Pour a binary compound down the center (ie epoxy?).
3) Weld a steel rod inside the cam. (This idea worries me since it would probably require the cam center to be drilled before hand... which might re-loosen the lobes.)

I would be most appreciative for any insights here.

Walter Carter, Palm Springs, California

 

[Torquey]

Wow! Thanks for the link Thundair! That looks like just the ticket.

 

[Fabrico]

Assuming the deflection is always the same direction, you could insert a solid or hollow bar that is fastened on its first end relaxed and its second end with preload. If well thought out, it could be simple, cheap, and failsafe.