Just a small correct, the KPB110 displacement of 1598cc should read 87.8mm bore with a 66m stroke.
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Also the Ts cup had different classes limited by their engine capacities.So i wonder which class the lz14 beasts ran in.
There were 2 categories i.e. TS-a and TS-b. TS-a I believe catered for up to 1600cc whereas TS-b catered for the bigger cars e.g. Skyline GT-R, Mazda Savanna RX3 etc. The TS-a class at the time was dominated by the Toyota Celica 1600 GT until the Sunny LZ engine was permitted by the FIA for use in 1973.