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340 exhaust manifold

Started by 73chalngr, October 06, 2018, 04:23:57 PM

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73chalngr

Does anyone know the correct size of the bolts for the exhaust flange for a 340 with the 1970 manifolds . My gasket failed and my bolts seem a little small the nut side had washers  and the washers are bent a little bit Like they were undersized  bolts and nuts .

Rich G.

The flange bolts are 7/16 . The manifold to head are 5/16

Topcat

It's true you don't need gaskets and just use a sealer.

Some like using an exhaust gasket.
If you decide to, use the Cometic Copper ones.

They work excellent and seal very well and don't burn out.


Dakota

Quote from: Chryco Psycho on November 09, 2018, 06:54:46 PM
unless you have the heat sheild gasket on the left side you are far less likely to have a leak if you do not use a gasket & just a thin layer of Ultra copper silicone sealer instead , Gaskets cause leaks

I have the heat shield.   Ultra copper on both sides of the heat shield, gaskets on both sides, or something else?

Chryco Psycho

just Ultra copper on both sides of the shield

Morty426

How come you guys keep taking about the shield and how the manifold attaches to the head?

This guy want to know the size of the flange bolts - manifold to exhaust pipe. 

:wrenching:

73chalngr

Thanks for responding . Way back in 1990 when my motor was put together we had no idea what to do so I think we used a set of header gaskets we had  .