440 cylinder heads

nqkjw said
I replaced 906s on my 440 with 915s fitted with 2.14/1.88
Had 40thou composite gasket with 906's and was reassembled with 20thou tin shim gaskets.

All cc'ed accurately before and after.

Before was 8.4:1
After was 9.3:1

That's probably accurate, that's a 440. I was talkin about the 400.