CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: Bigfish45 on June 09, 2021, 01:49:00 PM

Title: Big Block Exhaust Manifold Bolts
Post by: Bigfish45 on June 09, 2021, 01:49:00 PM

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

Title: Re: Big Block Exhaust Manifold Bolts
Post by: 69Z28-RS on June 09, 2021, 02:46:55 PM

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

Title: Re: Big Block Exhaust Manifold Bolts
Post by: x66 714 on June 09, 2021, 03:52:34 PM

I can't see the heads on these bolts but most of mine have the double circle with 6 lines (grsde 8) 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

Title: Re: Big Block Exhaust Manifold Bolts
Post by: firstgenaddict on June 10, 2021, 12:00:09 AM

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.