head torque

[flathead4dr]

Can anyone tell me the torque for head bolts on a Thomas alum . head model A diamond engine. Thanks in advance. Bill

 

[Mitch//pa]

i did a search and came up with this thread

http://fordbarn.com/forum/showthread.php?t=33673&highlight=thomas+head+torque

 

[Jim Brierley]

I torque my aluminum heads to 55 lbs. Aluminum and iron do have different expansion rates but 55 works nicely. Spark plug manufacturers also recommend less torque when Al heads are used, and always use anti-seize on plugs in Al heads.

 

[Cajun]

Be careful of the 2 head studs on the water outlet. The Thomas head is a bit thick and sometimes the studs do not have many threads in the block.

 

[hotmodelaford]

55 lbs. should do it. Re-torque in four hrs. of running, then again in 10 hrs.. It should not take any torque at that point.