It depends on year/size and if it is stock or not normally aspirated or force induction, flathead/OHV/sohc/dohc.
Lows
1930's Ford flat heads made as low as 50hp
mid 70's chevy 262 was as low as 110hp
Up to..
Highest HP push rod v8 NA
1964 12.5:1 426 Hemi, under rated at 425(actual HP around 600hp race fuel)factory drag car
2012 corvette Z06- 7L 505hp
Highest NA DOHC
Ferrari 458 - 562hp@9,000rpms
Highest forced induction V8
production car-ssc tuatara 7L TT 1350hp
top fuel dragster supercharged V8- 7,000-8,000hp@ 9,000rpms on 90%nitromethane
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