I have the DLI rockers on mine. Been on there for almost 5 years running mid 9s and a lot of street miles. I check the valves twice a year, but they never move really.
From what I've been told, unless you're running 8k+ rpm on a regular basis, the T&D/Barton rockers are not needed and have no benefit. Nothing wrong w/ them at all, just money you don't need to spend.
They are pretty though.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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