[Blown353]

No sealers required (or wanted) for any of the MLS gaskets except a little dab up at the thin corners near where the head gaskets poke into the valley but your block and deck need to meet the surface finish and flatness requirements if you want them to seal and not leak.

I have a set of Cometics sitting on the shelf in my garage because a couple spots on my block around a couple of the coolant passages were up around 40-42 RA; I decided to try the Fel Pro #1142 MLS gaskets instead and they work flawlessly. I actually prefer them a bit to the cometics because of the additional sealing beads of viton around the coolant passages make them a little bit more forgiving.

I have heard of guys with "questionable" surface finishes spraying MLS gaslets with aluminum or copper gasket maker or spray hylomar prior to installing and getting away with it but I would not recommend it, increased chance of a problem down the road. When installed properly they're pretty much bulletproof and a "install it and forget it" item.

No special torque down procedure needed for MLS gaskets but like with any performance engine you should have the block torqueplate honed using the same headgasket and fastener type (bolt or studs) you intend to run when you actually assemble the engine to simulate the actual in-service bore distortion.