Header bolt size

[Darth Plasma]

My 87 has aftermarket headers and they must have been on there a long time because the gaskets are shot and they're rusty. I can't take the obnoxious ticking anymore and constantly applying header sealant paste that keeps blowing apart. The bolts don't look too bad but I know it's a guarantee to break at least one or 2, so I'm getting a new set. What size are these? I keep coming across both 5/16" and 3/8". I'm assuming they're like an inch in length too?

 

[TubeTruck]

Mine are 3/8" and about an inch long

 

[Darth Plasma]

Mine are 3/8" and about an inch long

Thanks

 

[bucket]

They will probably all come out without breaking.

 

[78C10BigTen]

They will probably all come out without breaking.

Manifold bolts...yes they usually break but since using headers they ususlly loosen on their own! Always have to keep tightening them when i start hearing the ticking

 

[Darth Plasma]

Manifold bolts...yes they usually break but since using headers they ususlly loosen on their own! Always have to keep tightening them when i start hearing the ticking

I'll use a high temp thread lock for the new ones