Porsche 928 Workshop Manual page 299

19
Engine/Cooling
928
NOTE
If cylinder heads had been machined or ground,
check that thermostat housing fits correctly
afterwards. It must not be installed with tension.
If necessary, correct by machining mounting bores
19.10 Disassembling and Assembling Thermostat Housing
for Cooling System
VII, 1983 Printed in Germanv