The Apache heads don't have enough material in the area you need to drill to use them with the Hellcat intake/supercharger, the Hellcat cam has more Exhaust Duration then the SRT392 cam, If I remember correctly it's also a smaller lift on the intake(557 Vs 571).vs the SRT392 cam
(not my photo) in the photo you can see where the Hellcat intake bolts and where the Apache intake , bolt holes are not drilled.
The company I work for had some Hellcat engines in for testing, one dropped a valve and we tried to replace it with an Apache head, no good kept cracking where we drilled for the Supercharger/intake bolts

Hellcat head.jpg

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