All 1973-1980 900/1000 heads swap with no issues. The 900's use 6mm exhaust studs while the 1000 uses 8mm. Other than that pretty much identical.
Later, Doug
1978 z1000 Streetfighter
1976 z900 ‘Stripfighter
1978 z1000 w/RC Turbo
1979 z650 Resto-Mod
1983 Gpz750 Resto-Mod
2018 Z900RS
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