Magnum heads seem to be bad about cracking but I don't know why.
chris@slowcar.net wrote:
> Well found out why the crank on the 318 broke - it turns out one of the heads was cracked all
> the was from an intake port - chamber - exhaust port. Had it pressure tested and magnafluxed before
> we had it worked over for the new motor.
>
> Truck never overheated, never head debris or anything in it, etc. Is there a known problem with
> heads doing this? A few of the valves kissed the pistons when the crank let go, but no damage
> to the heads - and I figure the pistons would shatter before the head cracked? (who knows).
>
> Anyone ever had the problem / and ideas on how to prevent it?
>
> Thanks,
> Chris Bennight
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