Unless something has changed structurally with them to make them stronger than their original offering, I'd be careful about building a race motor with those. Can you explain or elaborate on the power level you're referring to? You build way more powerful stuff than the average Mopar guy does Darren, lol.
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
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