For anyone looking to Upgrade from the Fully Threaded
Dorman shorter replacement M8 X 1.25 X 30MM Exhaust Manifold Bolts to the LONGER ones required for the
Dorman version of the GM 4.2L Exhaust Manifold
that has the 5MM THICKER Flange ... eBay has the
M8 X1.25X 35MM @ 50 Count Pack for $32.38 that breaks out at right around
$00.65 Per Bolt:
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I have other applications that require using these identical bolts... so having the others as Extras on hand ...is
never a bad idea. What is NICE about these
10.9 Hard Flanged Cap Screw Fasteners is that they are designed with a smooth portion, just under the Flanged Area with Partial Threads (PT) further down their lengths.
Usually, the
GM OEM Bolts are FULLY Threaded in these same locations where Rust, Corrosion and a Loss of Bolt Strength over time can more easily attack the OEM version
...inviting them to Snap OFF all along the Exhaust Manifold Flange Line:
Here are some images to bear out these differences:
...and FWIW... THESE Fasteners have been "Made In The USA"