The '73 industrial 413 block I have isn't crazy thick. I can't recall the thickness from memory, but I wouldn't go past .060" or .070" over. I checked it after hearing about how they were really thick and would easily go to 4.320". Not true w/ the one I have.
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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