How do you torque aluminum heads?

How do you torque aluminum heads?

Torque to 70 ft/lbs. for 7/16″ bolts or studs (289 or 302) or 100 ft/lbs. for 1/2″ bolts or studs (351W) in three or four steps following the factory tightening sequence. Then tighten the long (upper) head bolts or studs to 80 ft/lbs.

Can you’re-torque head bolts?

Certain types may require you to re-torque the head bolts. And if it’s needed, you should do it. Re-torque the bolts as required while your engine is warm. But if you’re using aluminum cylinder heads, you should wait until your engine is complete cooled until re-torquing.

Should I reuse cylinder head bolts?

Damaged Head Bolts Bolts with any signs of damage, no matter how slight, should never be reused. Not only will the bolts eventually fail, but when they do, there is the potential for them to cause damage to your cylinder head.

What is the torque for aluminum heads SBC?

Torque specification is 45 lb/ft. Be sure to put thread sealant or RTV silicone sealer on any stud or shaft bolt that threads into an intake runner, and use anti-seize lubricant on any stud or shaft that is being threaded into aluminum.

Should you’re torque aluminum heads?

You should definitely re-torque the heads. Aluminum grows quite a bit, the manufacturer told me the heads would grow .

Do I need to Retorque aluminum heads?

Modern head gaskets don’t have this issue and as such don’t require retorquing. If you feel the need to retorque your head bolts or studs then follow the same pattern as you did when you initially torqued them down, do one at a time, and, especially with aluminum heads, we would advise doing it on a cool engine.

Should you’re-torque aluminum heads?

What happens if I reuse head bolts?

Can I reuse head bolts? A head bolt should not be reused if the threads are galled or badly damaged. Chasing damaged head bolt threads with a die will clean up the threads but also remove material (metal) and undermine the head bolt’s ability to torque down and hold to specs.

Can I reuse torque to yield bolts?

Torque-to-yield (TTY) head bolts are designed to stretch when used. Once stretched, they are not as strong as before. Consequently, they cannot provide the same amount of clamping force and may break or shear off if reused.