[A26B]

It's hard to seal a full boogie mono runner. Engine de-cel creates very high vacuum and there's simply not much area to provide sufficient clamping friction to keep the gasket in place.

Adhesive:
It makes cleaning difficult, but use an adhesive on one side only, such as the injector housing, so you can apply it easily. Laquer glue gives you more time, super glue is anaerobic and sets quickly.

Standard Adhesive:
Lacquer glues require one side to be absorbent. Gorilla glue looks to be feasible.
https://www.zoro.com/gorilla-glue-al...13/i/G0912441/

Anaerobic Adhesive (Super Glue) (#30)
http://www.stewmac.com/Materials_and...uper_Glue.html

Recommended procedure:
1. Spray silicone onto only the top surface of the "thicker-3/64" (10168684-X) gasket & allow to dry.
2. Apply the adhesive to the injector housing
3. Lay the gasket in place on the injector housing
4. Mock install the plenum & bolt in place, tightening with the proper sequence
5. Allow 24 hours before removing the mock installed plenum

Now do all the under plenum attachments for final plenum install

The silicone will help prevent the gasket from being damaged during subsequent removal(s) & the adhesive will hold the gasket in place.

added note

Re: Warping from welding. Everyone I've talked to that has built a mono-runner plenum encounters warping. It can be severe and require extensive metal removal during re-machining of the gasket mating surfaces. It needs to be checked with a precision straight edge from side to side and length ways. Gaskets can only do so much to seal irregular surfaces, typically in the 12~20% range. Example, our thicker gasket is 0.046" thick, uncompressed. Maximum irregularity would be in the 0.007"~ 0.012" range.

We had a customer working on a Lingenfelter 415 with a mono-runner plenum, encountering difficulty with plenum sealing. It was severe enough to require gluing/laminating 2 gaskets together & gluing to one surface.

Over torquing can work, just depends on how bad the warp is.