David, with most, if not all, head bolts have to be tightened in stages. In the M103, there is an initial torque, a second torque setting defined in an angle tighten of 90 deg and then a last tightening of 90 deg. The head bolts then have a conistant torque applied. Most engines today use the angle torque method.

Do not skip the middle step and thighten 180 deg.

__________________
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.