Can you use Grade 8 bolts for head bolts?

Can you use Grade 8 bolts for head bolts?

One more comment in answer to the original question: do NOT just go down to the hardware store and pick up some grade 8 bolts thinking they will work for head bolts. Head bolts are machined with a shoulder on the shank to fit tightly with the bolt hole, whereas hardware store bolts don’t have this as a rule.

Are head bolts hardened?

Engine Head Fastener Design Engine head bolts can be cold-fabricated to increase their integrity, and are often thermally treated before they are machined or have threads cut into them. They provide relatively high strength and durability, and frequently come packaged with hardened washers or nuts.

How much torque does a Ford head have?

Tighten the head’s shorter bolts to between 15 and 32 ft-lb of torque. Tighten the longer bolts to between 30 and 36 ft-lb of torque.

What are the torque specs for the cylinder head and intake manifold?

Install NEW cylinder head retaining bolts and tighten in sequence in four steps: Step 1: Tighten to 70-90 Nm (52-66 ft. lbs.). Step 2: Back off all bolts 360 °. Step 3: Tighten to 45-55 Nm (34-40 ft. lbs.). Step 4: Tighten to 85-99 Nm (63-73 ft. lbs.). Over the entire cylinder head gasketsurface. Intake Manifold

How much torque do you put on a bolt?

Tighten the longer bolts to between 30 and 36 ft-lb of torque. Finally, tighten each bolt an additional 175 to 185 degrees. Tighten the rod bearing nuts to an initial torque setting of 29 ft-lb of torque, then tighten each nut an additional 90 degrees. Tighten all but the rear cap bolts to 91 ft-lb of torque.

Can a stretched T-T-Y head bolts cause a gasket failure?

Reusing stretched T-T-Y head bolts can cause improper or uneven torque, damaged engine threads, and broken bolts, any of which could lead to head gasket failure. It is important to use new bolts and proper torquing procedures during reassembly. When a Torque-To-Yield bolts are installed, they are first tightened to a specified torque rating.