Are girdles generally added for big rpm or HP or torque

nm9stheham said
IM, in relations to Rumble's question.... did your machinist explain what is causing the cap walk?

Same question to FB... Is there an explanation of what is making the caps/studs to whip around? Is this just crank flexing working through the bearings, or some resonance, or ???? This article for Ford mentions 'harmonics', which indicates resonant problems.
D.S.S. Racing - Main Support System And Pro-Tray Windage Control<meta name="description" content="D.S.S. Racing's Main Support System Dampens Harmful Harmonics That Cause Cap Walk And Can Crack Engine Blocks. The Main Support System Is Affordable And Easily Installed. D.S.S. Also Offers Increased HP With The Pro-Tray Windage Control.">

And yes, the girdles have the strength to control this direction of movement. This sounds like a good explanation. Many thanks!

I don't remember if he ever explained it I do remember very well that he said "wait a minute"....... walked away and came back and put a factory SBC 4 bolt cap on his desk, next to mine. Pretty dramatic difference.

I think our caps are just too flimsy with only a 2 bolt connection. Once you start increasing stroke and upping the torque they just can't hold still. Just my theory. I think the 340 blocks might be even more prone to it. Again, just my own theory.