Yes...
You might even say that I've done an "EXHAUSTive" Study on this problem... :>)
The FelPro Bolt Dimensions are
M8 X 1.25 X 30mm as listed below for the
Original GM OEM "Stock-As-A-Clock" Exhaust Manifold. They will be
TOO SHORT by 5mm if you are using Dorman Brand Replacement Exhaust Manifold:
As long as you choose a
10.9 Hard Bolt with the Dimensions of M8 X 1.25 X 35mm ... they will work fine. I prefer After Market Brands like THESE as an alternative because they provide a smooth, un-threaded area under the Large Hex Head Flange Cap Screw
(PT = Partial Thread).
This design discourages Rust and Damage from Flexing due to the absence of the thread line catching Water and Rusting. They also sport a Wider Contact Surface under the Hex Head which spreads the contact load over a wider area of the Cast Iron Exhaust Manifold Bolt Hole Surfaces:
Forgive this slight chastisement... But... Taking Images of any Engine Work you do and Posting them back here at GMT Nation involving any Major Components R&R
is almost a "Right of Passage" that will endure in your Personal Threads
for as long as Grass is Green... and Skies are Blue.
Much can be lost in the translation of "Plain Text" and in the absence of
ALL of us being able to actually
SEE what it is that you are looking at, it can be a bit confusing. In this instance ...I thought at first that you were talking about the Three "Donut Flange" Bolts connecting the CAT Can to the Exhaust Manifold, instead of the ones I've just thoroughly thrashed out for you ...above.
I'm sure you can appreciate these distinctions after SEE-ing THESE.
One Last Suggestion...
If you have Two or More Broken Exhaust Manifold Bolts... Worn Out Motor Mounts comes into the Picture. There are quite a few Good Threads covering their R&R and while you are at it, the Replacement Transmission Mount should be thrown in for Good Measure. Use ONLY the GM ACDelco OEM Flavor.
THESE are the Ones You Want:
