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I suppose you also have to think about all those magnum engines still running out there today, the majority of those heads are cracked too, and their owners are unaware because they don't have any problems.

I pulled 4 darn mag heads at a yard to find them visually cracked, then found 2 that were not, took them to the shop to find they magnafluxed as cracked. Before that, had a set of 308 heads that a bad eng shop did a valve job to, took them to a different guy who started cutting the seats and...

Make sure it turns over freely. I had a magnum engine pulled in a yard, took it all the way home, turned the crankshaft over to find that #1 piston did not move at all..crank or rod was blown. Luckily they had a good return policy and exchanged it for another. And yes you usually can see the...