I have the Barton manifold on mine, but I have the Indy 426-4 manifold sitting on the shelf waiting to go on. It has larger runners and plenum area. It's the biggest cast single 4 manifold for a dominator out there. The Barton is a good piece, just not as big as the -4 Indy. CHIP

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax