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from what I've read... block is good for 700-800 as mentioned above.... its the interanls letting go in the 475+ range that break the block.... forged interanls good for 600-700 and you block has nothing to fear....
A guy who does allthe work on my car said 1000hp. hes been building engines for 6 years and is passion is mustang SO i believe him. hes putting in my internals