So, in the interest of discussing the 53 blocks... I have heard a whole bunch of theories about this, including if the 53 block was specifically made in Brazil. Everyone I know who races runs a 53 block, myself included. Now, temps may cause cracking, but personally I have run excessive temps forever (2000+EGT), enough to kill turbos, heads, and melt a piston (badly, when I blew an intercooler last year). So far my blocks have been just fine (knocking vigorously on wood right now! lol).
Are we just talking water temps? I've also run these up very high, still with no block problems.
Anyway, I do appreciate this topic being addressed, and ain't tryin' to cause no trouble (pilgrim). Just thought I'd inject my too sense. Hoping I'm not cursing myself in the process... :-laf