1964 XK in speed boat

[davidsxj6 (David)]

Here’s a good comparison:

E-type engine rebuild- oil pump and distributor drive issues

The two 3.4/3.8 pumps have 1/2" shafts. The two unmarked 4.2L pumps have 5/8" shafts on both the drive and cover side, the COUNTRY pump has a 5/8" shaft on the drive side but 1/2" on the cover side. [PXL_20201121_162606342]