[AT] Torque for bolts vrs studs in cylinder heads?

[D8RMAN at aol.com]

John, There are a whole bunch of GOOD reasons to stay with all of the OEM  
parts and torque specs on head bolts! You may get away with some non-OEM parts  
sometimes but it is like gambling with your engine's life span. Granted it  
varies from engine to engine, usually older engines have more room to play with  
and more modern engines have tighter specs with almost no room for error. 
Some  head bolts are TTY and can only be used once. The headgasket thickness also 
 matters on some engines especially if you have had the head resurfaced.  
Sometimes the OEM manual will give 2 torque specs with the head bolt dry or oil  
on threads. Studs or bolts of the same grade should be the same spec I think. 
If  you lower the grade of bolt you may be asking for problems. Just my 2 
cents.  Willard Smith, Tacoma, WA.

About how much more torque would be required for using bolts in an  
engine head vrs. the regular studs?  (One for the  experts!)   John W.

In the wide-open spaces of NE  Oregon







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