Rapid fill chamber to valve housing port info. please

[Deejayuu]

Thanks for looking. Further tampering with the poorly Rapid. These are sub. 12 and FAC blocks.
Intrigued how the hole is made in production. One seems to be enlarged by skew drill from outside

[Millingman]

Not liking the look of those threads, look very ragged, is it an original block? The threads should be blued if original, looks very rough.

[KevG]

some were blacked on the internal threads and some were not.
KevG

[Squinty]

Drilled/milled from the inlet to valve chamber