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What size are the exhaust manifold bolts?

The size of the exhaust manifold bolts can vary depending on the make and model of the vehicle. However, there are some common bolt sizes that are typically used for exhaust manifolds. In this article, we'll provide a detailed overview of the typical exhaust manifold bolt sizes and the importance of using the correct size.


Common Exhaust Manifold Bolt Sizes


The most common exhaust manifold bolt sizes are:



  • 8mm: This is a common size for smaller engines, such as those found in compact cars and some SUVs.

  • 10mm: This is a more common size for larger engines, such as those found in trucks, vans, and some SUVs.

  • 12mm: This size is typically used for high-performance engines or larger displacement engines, such as those found in some trucks and high-end SUVs.


It's important to note that the bolt size can also vary depending on the thread pitch, which is the number of threads per inch. The most common thread pitch for exhaust manifold bolts is either coarse (1.25 mm) or fine (1.5 mm).


Importance of Using the Correct Bolt Size


Using the correct size of exhaust manifold bolts is crucial for the proper functioning and safety of your vehicle. If the bolts are too small, they may not provide enough clamping force to hold the exhaust manifold in place, which can lead to leaks and potential damage to the engine. Conversely, if the bolts are too large, they may strip the threads in the cylinder head, causing even more serious issues.


It's always best to consult your vehicle's service manual or a professional mechanic to determine the correct size and thread pitch of the exhaust manifold bolts for your specific make and model.

What is standard exhaust size?


There is no one-size-fits-all standard exhaust size. However, exhaust systems for most passenger cars and light trucks typically have exhaust pipe diameters in the range of 1.5 inches to 3 inches. The specific size can be influenced by factors such as the engine's displacement, horsepower, and emissions regulations.



What size are the bolts on a 350 Chevy exhaust manifold?


These bolts are a standard 3/8" coarse thread.



What nuts to use on an exhaust manifold?


Castle or Locknuts is what you should use for exhaust manifold, and use threadlock red. Should use the threadlock on the studs into the head and on the nuts. If you do it right, you won't have to retighten them or lose any.



What size are SBC intake manifold bolts?


Factory sbc bolts were 3/8"-16 at 1.25" long.



What class bolts for exhaust?


The recommended grade of bolts is 8.8 tensile or higher so that you can tighten them without stretching or breaking the bolts. There is also the use of locking nuts, Loctite, or spring washers. It helps to prevent the nuts from vibrating loose.



Is it OK to reuse exhaust manifold bolts?


The exhaust manifold studs and the exhaust manifold bolts may be reused.



Should you put anything on exhaust manifold bolts?


Utilizing the correct, best anti-seize compound for exhaust manifold bolts can be an excellent way to prevent seizing, galling, and corrosion in areas that are regularly exposed to high temperatures. They are rust and corrosion inhibitors that can give you the upper hand the next time you remove your exhaust manifold.



What type of bolts to use on an exhaust manifold?


Cadmium plated bolts/studs would be corrosion resistant and they get along well with alum. I use the black socket head cap screws grade 5 or 8. I found these to be the easiest assemble and remove with extensions and ball end Allen wrenches.



What size are exhaust bolts?


【Exhaust Bolt Size】- Thread Diameter 10 mm, Thread Size 1.5 mm (M10), Screw Length 35 mm. 【Exhaust Bolts And Nuts】- Aftermarket 03423 Exhaust Manifold Hardware Kit. The bolt kits are ideal for securing exhaust components and eliminating exhaust leaks.



What is the difference between B7 and B16 bolts?


Although A193 Grade B16 bolts and studs have similar strength requirements as Grade B7, the vanadium and higher tempering temperature helps the fasteners retain their molecular structure and strength under higher ambient temperatures than Grade B7.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.