Throwing this out there as I am at a loss as to what may be happening.

INFO: Stroked Indy aluminum block 500 cu in, Indy 440-1 heads, 871 hi helix Blower Shop Blower.
It is in a 245inch Dragster shifted at 6800 trap at 7000.

Problem is the lifters are breaking at the tie bars. The button is breaking off the lifter letting the tie bar loose, this is the 3rd set in 4 seasons, 2nd set since late last season.

Ideas??

Dave