What type of bolts should I use to attach headers to a crossflow?
Grade 8 OK? Something that will be easier to remove once used.
Bob
exhaust header bolts
Bob,
Grade 2 ( low carbon steel ) bolts are sufficient. Attach 2 studs on both ends of the cyl head to make it easier to line up the manifold. Install 1/8" flat washers for the bolts and nuts ( adding lock washers is worthless as they weaken by heat ) then use thread-magic anti-seize and torque them to 15-18 ft lbs. You will need to re-torque after +100 miles.
Grade 8 bolts are usually used for high torque appl. i.e. torque converter and flywheel bolts. Grade 5 for cyl. head bolts.
Pete
Grade 2 ( low carbon steel ) bolts are sufficient. Attach 2 studs on both ends of the cyl head to make it easier to line up the manifold. Install 1/8" flat washers for the bolts and nuts ( adding lock washers is worthless as they weaken by heat ) then use thread-magic anti-seize and torque them to 15-18 ft lbs. You will need to re-torque after +100 miles.
Grade 8 bolts are usually used for high torque appl. i.e. torque converter and flywheel bolts. Grade 5 for cyl. head bolts.
Pete
Actually grade 8 bolts anywhere in an exhaust system are a bad idea, the heat affects them in a bad way. They become very brittle and will break off on their own or when you decide to try to remove them. It is a phenomenom called hydrogen enbrittlement (I think). And yes I have tried this and failed.....
Rob