One head no, the other head maybe. The roller rockers need to come out to get a spring compressor in there, and they run on a shaft which goes the whole length of the head. On one side those shafts come out forwards, but on the other they would hit the firewall.
I don't know how you would compress the springs with the heads on. I know on some engines it can be done, but I've never tried that on any engine tbh so couldn't really comment on that aspect of it.
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