Once upon a timing chain: Clearance issues aren’t always very clear

When last we left the troublesome reassembly of the twin-cam motor for my 1974 Lotus Europa, I’d spent a month trying to fit the custom inner and outer timing covers needed to receive the new cartridge-style water pump. This is a desirable modification that allows you to change the water pump without having to pull the motor and yank the head, but the pace was glacial due to the need to test-fit everything before assembly.

This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2019/03/11/fixing-timing-chain-clearance-issues