we have been thru 3 different types of cork/rubber over the years. the first was a dark colored blend, then it was discontinued and we went to a lighter shade colored mixture. that is the ones we saw issues with, I still have about 100 of them in a box here that I use for pressure testing here. Over a year ago when we saw that the 2bd material was slipperier against the mating surface and was compressing outward in some cases when they were not torqued evenly we switched to the material we are using now with a strong concentration of Viton rubber to it, they are back to a darker colored gasket and I am very happy with them. we install them with a light spray of 3m super77 on one side and stick them to the underside of the manifold on the bench, then tilt manifold onto its side and insert the bolts thru and then pick everything up together and go to the supercharger to bolt it down, starting with 5ft pounds from the center out and then 10 ft pounds from the center out. then checking them after the test drive at 10 ft pounds again.
they do have a different feel to them than a traditional "hard" gasket and I can see how some people tend to not like them.


the mr. gasket materials linked above and also their white colored materials we tried back before we went to the cork, those materials we saw leaking right through the gasket material itself. I would have loved to be able to just buy those sheets and cut them out but they just did not seal for us, both waterjet cut and scissor cut.


let's try this, the squeaky wheel gets some grease, I just got off the phone with the waterjet shop and they will be cutting a pair out of 3 different copper thicknesses for us to test with next week. can anyone think of something better to use than that without using a sealant that can cause debris to fall into the motor upon disassembly, I am looking for a "dry" solution.