Almost positive the LS7 head requires a 4.100" bore, so the LS9 (4.065") wouldn't work without machine work being done first.
Quick search and it seems a few people have made the heads work, but it required smaller intake valves and at that point why not just use a different head.
William
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Texas A&M BSME 2008
1969 Camaro - Hugger Orange
1969 C10 SWB - Hugger Orange
1992 Corvette ZR-1
2021 Ford F250 Tremor
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