Tracing engine number

[HK1837]

Thanks guys! One last question would Qr613835 be early 75 in a 253?

Yes, around January '75, possibly Feb-Mar if the engine was at the back of the storage or got dropped or damaged in some way.

[No van man]

Can you guys shed some light on these please.
QT1227 D221
QT959611 9E8
QT295294 A243
11ZT40379 6F9

[HK1837]

QT1227 is from a HQ GTS coupe built pretty early in HQ (it is the 227th number in the HQ engine series).
2nd is HZ mid '78, anything but Deville or Caprice.
3rd is HQ early 1973 anything but Statesman, Deville or Tonner.
Last is from a later 1979 HZ Deville or Caprice.

[No van man]

Thanks Byron