340 heads on 360?

AJ/FormS said

Do cracks make them unuseable?

Click to expand...

Not necessarily. But the second you say cracked head, everybody runs like the house is on fire. The Magnum head, is also prone to cracking as well, but they remain in service on running engines for hundreds of thousands of miles and driver/owner never even know’s they’re cracked.

Of course your machinist will. It work or port a cracked head to start with so good luck on finding a sound head to start with. It may or may not be a challenge to find a cracked head.