I have had one since they first came out whne I first built my 408 stroker from my factory magnum block. Stock main caps and 8rpm with ZERO signs of cap walk and my main bearings are always perfect looking on disassemble. I don't suggest doing 4-bolt splayed caps in a magnum block because if you look at the main webbing it doesn't have alot of meat there as it is. You got doing 4-bolt caps and you are just removing more meat from the webbings. Then you are adding the stress into the webbing area that is alredy the weak point of the block. I machined my main caps to sit the girdle down on them tight and the girdle also acts as a crank scraper. I have been spraying the piss out my 408 for shoot 8 years now, same crank,rods,pistons just new top end and rings/bearings. Never had to turn the crank once and I first built this motor back in 2004.