Dorman 03413B Exhaust Manifold Hardware Kit Compatible with Select Models

Good product just didn’t work for me.

Great replacement bolts, worked perfectly

These exhaust manifold bolts are in good quality for the price. They fit perfect on my Jeep Wrangler JK. If you're doing your exhaust manifold, it is recommended to buy new set of bolts. These bolt are perfect fit. 5 star rating.

I put these on my Chevy Silverado to replace the old broken manifold bolts, and they work great just dont forget anti seize or it will be a pain to get out again.

Installed on '03 Trailblazer 6-popper 4.2L. All Trailblazer/Envoy/etc "Atlas" 4.2L DOHC engines should be similar. This was with the Dorman 674-777 exhaust manifold "Kit" for this vehicle.Received 12 bolts in the box as advertised. This application only needed 11, so this worked out well. Bolts were slightly shorter than originals--not enough shorter for me to care.Original bolts have thread-locking compound on them. Therefore, they're difficult to remove even after they're "loose". The thread-locking compound causes the bolt to turn hard all the way out. I dug out all traces of that chemical from the female threads in the cylinder head using a thread-cleaning "tap", and installed the bolts with anti-seize so they won't break next time they have to be removed.>>>TIP: Use a "universal-joint" socket to remove the old bolts, and DO NOT put side-pressure on the original bolts as you turn them. Side pressure will break the bolt shank even if the torque required to turn them doesn't.<<<Original bolts were Grade 9.8. These are 10.9. Should be stronger than the original bolts, but these are made in China, so quality grading is suspect.Flanged heads cover the oversized holes in the exhaust manifold.My Official GM service manual says 15 ft/lbs in one place, and 18 ft/lbs in another. I put them in at 15 ft/lbs using anti-seize as a thread lube.

Way cheaper then going thru other sites & local auto parts Bolts are so over priced these days. Great deal. A must for changing rusty old exhaust manifold bolts.

Only weird thing is factory bolt heads are 13mm and these are 12mm.

These manifold bolts worked perfectly for my 08 Trailblazer. Very good product.