5.9L Magnum questions

MechNerd said

I'd like to get others input too, but from the perspective of what they would do if the $$ was coming out of THEIR pocket.

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That is the biggest crack I have ever seen on a Magnum head so far.
If you are not in a big hurry, you could wait and see if Speedmaster does their 40% off sale for black Firday or cyber Monday and grab a pair Magnum new replacement castings.