Why would anybody fill an aluminum block - seems counter productive and a waste of time - I see no gain to be had. If you want a solid block (no water jacket) order one  If you need to concrete an aftermarket aluminum block...then you are starting w/ the wrong block. As much as aluminum blocks move around, filling one w/ concrete is not something I'd be doing.
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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