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HQ_SS_Andy Offline
#1 Posted : Saturday, 23 April 2022 10:26:47 PM(UTC)
HQ_SS_Andy

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I've noticed on a few 253 engines that the engine casting date has month and day format flipped.
I read that the early blocks had month/day/year and later had day/month/year. I guess the early format was US format.
Does anyone know when they changed formats ?
Was this format variation the same for all Holden engines ?
HK1837 Offline
#2 Posted : Sunday, 24 April 2022 8:21:24 AM(UTC)
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I'd have to go and look at photos but I think it was later in 1973 that V8 blocks switched from North American format. 6cyl were in US format too but from memory they changed a little earlier.
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HQ_SS_Andy Offline
#3 Posted : Sunday, 24 April 2022 10:36:14 AM(UTC)
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Thanks for the info. I've seen late 1972 V8s with US format, so that tallies what you suggest.
Rgds.
HK1837 Offline
#4 Posted : Sunday, 24 April 2022 11:07:54 AM(UTC)
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I have an M3 on a 308 so it'd changed by December 1973. The closest I can find earlier than that is D303 on a 308 so its between April 1973 and December 1973.
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