Someone asked how many XK engines were made.
Here are production totals summed up from individual car model totals in the book “Jaguar A Living Legend” published 1990 by Anders Clausager, which covers production up through 1988.
3-1/2 and 3.4 Litre to '68 - 117,837
2.4 Litre - 50,457
3.8 Litre - 90,829
4.2 Litre - 381,533
2.8 Litre - 22,725
3.4 in XJ S3 - 12,647
total = 676,328
caveats and possible inaccuracies:
XK150 used both the 3.4 and 3.8, but Clausager did not differentiate, and I could not find any other reference which did, so all are included in the 3.8 figure.
C & D Types, XKSS, coachbuilder chassis’ for DS420 hearse and ambulance are included;
coachbuilder chassis’ other than that, Alvis Ferrets, spares, racers, factory test mules, and any other outsider users are not included.
The XK engine continued in limited production to about 1991 for Daimler DS420.