Does anyone know what the head bolt torque should be on a 1928 Packard 6 engine?

G'day Model 61, The head tension for Packard with 7/16 20 TPI bolts is 60-62 ft lbs. I personally set my 533 to 55 ft lbs and have had no leakage problems in 20 years. I do check them every few years after a readonable days run. Set them with the engine hot and use the normal Packard tensioning procedure as for other Packard Sixes. best regards Peter Toet

i agree with Peter (55 to 60). do Not exceed 65, (block can crack)