What size are LS exhaust manifold bolts?

What size are LS exhaust manifold bolts?

ARP 12-Point Chromoly Header Bolts Set of 12, LS1/LS6/LS2/LS3/LS7 Fastener Style: BoltThread Size: 8mm x 1.25Head Style: 12-pointUnderhead Length (in): 1.181 in.

What grade are exhaust manifold bolts?

What grade are exhaust manifold bolts? 1-Stainless bolts and use antiseize when installing. 2-Use standard replacement grade 5 bolts and antiseize. 3-Use Grade 8 bolts with antiseize.

Do exhaust manifold bolts need to be torqued?

Over tightening can damage the seal or cause the manifold to warp. Any thing that has a seal should absolutely be torqued to spec. Anything that has a torque spec; which is really everything should be to avoid snapped of bolts or things falling off from fasteners loosing over time do to vibration.

Should you put anti seize on exhaust manifold bolts?

If you are reusing exhaust manifold bolts (which we don’t recommend), apply a metal fortified anti-seize to your manifold bolts. If you’ve just removed the broken bolts and ready to complete the repair, chase the threads clean and use fresh OEM bolts for best results.

Should I use anti seize on engine bolts?

Anti-seize should be used when dissimilar metals are involved (steel bolt into an aluminum brake caliper), when threads may be exposed to corrosive effects (suspension fasteners), where high-heat may accelerate corrosion (manifold, turbo, and exhaust fasteners), and on fasteners that frequently get removed (underbody …

How much does it cost to replace exhaust manifold bolts?

The average cost for exhaust manifold replacement is between $900 and $1,020. Labor costs are estimated between $267 and $336 while parts are priced between $633 and $684. This range does not include taxes and fees, and does not factor in your unique location.

What causes manifold bolts to break?

Each duty cycle will provide tension stress on the studs or bolts that hold the manifold in place. This expansion and stretching of the manifold bolts over numerous duty cycles eventually causes too much tension on the bolt(s), stretching them beyond capacity and causing them to fail.

How do you remove a hardened steel bolt?

How do you drill out a hardened steel bolt?

1. Go to a hardware or home improvement store for a cobalt bit that is designed specifically for drilling through steel.
2. If you want to remove a broken bolt without welding, center punch the broken bolt, then drill a pilot hole into the center of it with a left-handed drill bit.

How do you soften a hardened bolt?

Raising the temperature of the bolts above the original factory tempering temperature will soften the material. The longer you hold it there the softer they become. Normally the tempering process happens at 900-1000 degrees F, so your 1200 degree excursion has softened it some.

How do you remove a bolt you can’t reach the nut?

Try a 6-point wrench or socket on your seized nut/bolt. Start by rocking the bolt by tightening then loosing, this may be all you need to break through the rust. Try and avoid 12-point wrenches and sockets as they likely to slip and strip the bolt head.

Will impact wrench break bolts?

No, an impact wrench will not break bolts – in fact, it will take less torque to break the wrench’s drive than to loosen the bolts.