If I was in the market for another block right now and couldn't wait for a KB, I'd probably be looking into an aluminum Indy block from a good vendor.
I have a KB block and a World cast iron block. If the World block wasn't so daggum heavy I'd recommend it b/c the one I have has checked out great...it just weighs a ton. Seems like I've heard of the World aluminum blocks having some issues?
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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