Slightly lower compression in diesels can result in increased unburned hydrocarbon emissions and soot. Best guess is there were multiple thickness to make sure the engines would pass emissions within the manufacturing tolerances.
Obviously, they were made to adjust for manufacturing tolerances. There has been significant speculation why there were multiple head gaskets. Again the replacement head gasket will work in all engines. We have had a number of customers become very concerned they are not replacing the exact gasket that was originally in their engine. Lister Petter has discontinued all but one of the head gaskets and there is only one thickness head gasket available as service parts. The thickness of the head gasket is identified by small holes punched in the external corner of the gasket.
The Lister Petter LPW series parts manual lists three different thicknesses for head gaskets.
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