The older small block exhaust manifolds use special washers that allow expansion under the bolt/nut head. I thought I had read in a factory service manual or elsewhere that the two center bolts did not use these special washers, only the two fasteners on either end. However, on Ebay there is a fastener kit that included a special washer for each and every fastener. What is the correct application and why? Thank you.
In the drawing it shows no washers under the center, but in the picture you can see that there is washers under the center bolts. Take your pick I guess
They're called conical washers. I ended up using them on all the studs except 1 because the stud was too short. Here's a thread I started asking basically the same question....
