Big Block Exhaust Manifold Bolts

[Bigfish45]

Does anyone have a picture of the correct markings on original 1969 Camaro big block exhaust manifold bolts?

[69Z28-RS]

I believe they would be the 'std' 'double circle marked bolt heads...   Paragon Corvette has these in kits..

https://www.paragoncorvette.com/p-355204-exhaust-manifold-bolt-stud-kit.aspx

[x66 714]

I can't see the heads on these bolts but most of mine have the double circle with 6 lines (grsde going from the inner circle to the outer circle. My engine was built 08/21/1969. That doesn't mean that's correct for your engine as they bought bolts from different supplier....Joe

[firstgenaddict]

Big blocks use 2 different bolts one with a flange and one without the flange. 
Cylinders 1 and 7 - 2 and 8 use bolts with flanges
Cylinders 3 and 5 - 4 and 6 use bolts without flanges.