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""does the heads have air injection holes drilled in the heads?""

I am not sure what this means, so I have attached a photo of the heads before I bolted them on about 6 years ago. They were rebuilt and the bowls were blended.

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I don't think any of the J heads ever had air injection holes machine into them from the factory The air pumps would pump air into the exhaust ports from the holes machined into the heads for that, your heads don't have the holes