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This is the improved head gasket kit
Sump gasket Lister Petter
Overall length of the hose is 4 5/8 inches long
This part is the same as 40-2035068 and will be item number 1 in the Hercules drawing
ST engines were used in numerous applications
657-23503 ST1 Decarbon gasket set, Supersedes Part Number 657-23501. ComPac T24/33 This is the improved head657 23503 Lister Petter decarbon gasket set, former part number was 657 23501. This set is for a single cylinder ST model engine only. This set gives you the necessary gaskets to properly replace the cylinder head on a ST1 engine after removing the built up carbon. The ST model engine was used on numerous applications including generators, fan units, pumps and air compressors.