My block is on the way to Jim Stewart. A decision will be made according to measurements. I did talk with Cometic for awhile and told them about our problems and they were pretty open to the fact they know the F20C has more problems than most because of bore size. If I were to go with a Cometic MLS gasket it would be 89.5mm. Otherwise we will determine the best way to o-ring it and figured out what size wire and what type of clearances we have to work with they have SCE make a custom copper gasket. Should have more info on this mid next week