Definitely not always 52 deg. That may be a reasonable theoretical number to get started but not in practice...
My "little black book" "Hawk tune up guide" Published in 1975 has tune up specs for most USA/European/ Asian vehicles . E.g MG variants 1963-72 listed as 60 deg dwell; Toyota corolla/corona 52deg; Rover 2000TC, 2000 auto 1965-70 60 deg; Triumph Sptifire 1971-72 4 cyl Mk4 42 deg; VW various 197172 1600cc 44-50 deg etc
It all depends on the state of tune, as well as the electrical characteristics of the coil etc
cheers
MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
2020 Subaru Impreza S ('SWMBO's Express' )
2023 Ineos Grenadier Trialmaster (diesel)
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