Typically, M103 chains last quite long time because they are short, compared the the V8's.

Rotate the engine until the marks align at the camshaft and the front cam hearing/rocker arm holder. Then look at the crank damper and read the degree of offset. The chain tesnioner is a ratcheting type.

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.