Nice quote. That's old school. Head studs and bolts are better than they used to be. Tom, it all depends what you are building and to what extreme. There are all kinds of different torque specs and sequences for different applications. That above statement couldn't get more generic.All racing engines should be re-torqued regardless of the type of gasket being used. The purpose of re-torquing the cylinder heads is to restore the proper stretch to the head bolts after the first heat cycle. Physics dictates that the engine assembly will expand as the engine temperature increases, this expansion will increase the compressive load on the head gaskets causing a seating effect sometimes referred to as creep relaxation in composite head gaskets. The seating of the gaskets and threads results in a comensurate relaxation of the head bolts when the engine cools. Re-torquing the head bolts/studs restores the proper stretch to the fasteners which will insure proper cold sealing of the gaskets as well as proper combustion sealing under full load. One re-torque is all that is necessary, subsequent re-torqing can cause plastic deformation (stretch) of the head fasteners and damage to the head gaskets.
The process for re-torquing is as follows:
Start the engine & run with no load until operating temperature is reached.
Shut down the engine & let cool completely (overnight).
Retracing the original torque pattern, one fastener at a time, loosen slightly to overcome the friction set of the bolt or nut, then re-torque to specified torque setting.
I assume you didn't really read it, the basic idea does not really involve the the stretch of the bolts. It really has more to do with the gaskets and while the quote mentions composites, mls will do the same to an extent, though it's not really creep, it's more of a compression set.Nice quote. That's old school. Head studs and bolts are better than they used to be.
sorta :lol:You to just are keeping this going for your own entertainment.
I checked...it's 8,000,001 that say you shouldThere are 8,000,000 pages on the net that say you don't have to retorque. There are 8,000,000 pages that say you can.