[Healeys] Engine number

[simon.lachlan at alexarevel.plus.com]

It is 29D/RU/H4908

29 = 3,000cc (+/-!)

D = MkI BT7 or BN7 (per Clausager)

R= Overdrive fitted

U = Centre shift (per BMC parts manual)

 

The BMC manual is quite specific. See attached. 

Who is wrong? Did 29D engines continue into later tricarbs which is when, as
I understand it, centre shifts appeared?

Or what?

I am considering buying an engine and rebuilding it. There's a block on eBay
with that number on its plate. I think it's a MkI and that RU stands for
overdrive and that U does not stand for centre shift.

Am I right?

Thanks,

Simon

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