Here is one Nate, at Alabama Cylinder Heads.......looks like you'll need to swap your camshaft into it.
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This should be a NEW casting also, not a refurbished Mazda head. Most of the head re-builder's are using the new castings that are made at Alabama Cylinder Heads, I believe.
Here is a little info on them.......
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I actually bought a new head from Clearwater Cyl. Heads down in Tampa, FL and drove down there and picked it up.......was going down there to see the In-laws anyway.
Here's a few pics of it.....
I transferred all of the studs from the original cracked head to the new head before installing it on the rebuilt engine. He included a camshaft for me also, and I paid $400.00 plus dropped off an old cracked core for him as well.
Word of warning.......get a good book on these engines, like the factory service manual (PM me and I may be able to help you here) so you know exactly how to change the head out right the first time!