torque specification//spark plugs

[janko]

did a search and was able to find a torque specifcation for spark plugs for a 112 engine. 28nm and, if my conversion is correct, 247inlbs. question. this approximately 20ftlb figure hold for the engine in an 89 300e? working on someone else's car and do not want to screw up. thank you.
p.s. will be using a bean type torque wrench calibrated in inlbs.