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TTY (Torque To Yield) Bolts

 

There is a lot of talk that the stock bolts are super soft and junk after a single tightening.  Even the factory manuals say this.  However let me state that the below came directly from a Ford engineer that was part of the modular design team:


"Nick, You can torque the head bolts and main bolts a maximum of 5 times. Keep in mind that the main bolts are torqued a minimum of twice at the plant. The head bolts a minimum of once. If the engine was repaired, then you can add one more time to each."


Now I will state that I have reused every bolt on the motor including the head bolts and never seen a stock bolt fail. The only failures I have seen are ARP (head stud, crank bolt, rod bolt) and each broke just putting the motor together. IMHO - if its a first time rebuild every bolt could be reused with no problem.

 

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