All modular engines come from Ford with TTY (torque to yield) bolts for the cylinder heads and main studs. These are one time use bolts. NEVER REUSE TTY BOLTS no matter how good they "look". The reason for this is, when torqueing TTY bolts it stretches the fastener past the point of where it will not return to it's original length. This weakens the bolt and makes it unsuitable for repeated tightening. The head bolts used for these engines are long (210mm) these bolts penetrate deep into the cylinder block. The primary advantage of this long a bolt is structural rigidity to the block. Ford sells replacement head bolts under part # F5AZ6065A. Cost to replace all head bolts is a little over a 100.00. These bolts will work for normally aspirated applications, just be sure to follow the torque and angle method exactly as outlined in the service manual. As far as the main bolts go, Ford cost to replace these is well over 100.00. At that price there is no reason not to step up to ARP main studs.

The ARP studs listed on this page are 100% reusable. They offer a significant strength advantage as well as saving the threads in your block from repeated retorqueing. Using studs will make it much easier to assemble an engine with the cylinder head and gasket assured of proper alignment. Studs also provide more accurate and consistent torque loading. Here's why; when you use bolts to secure the head the fastener is being "twisted" when torqued. Accordingly, the bolt is reacting to 2 different forces simultaneously. A stud should be installed in a "relaxed" mode-never crank it in tightly using a jammed nut. Then when applying torque to the nut, the stud will stretch only on the vertical axis.

When purchasing your Head & Main studs don't neglect the cam bolts or harmonic damper. These are also rated at 190,00 psi, they are forged and heat treated in house at ARP, then impinged to remove any surface irregularities, ground, thread rolled and black oxide coated. At the price these bolts are offered there is no reason to take a chance on the OEM bolts.