the engines i used were both os 12 czz's. i dont think engines being identical is that important, same make and model yes but you will never tune them to be the same. if you want it to take off well without losing too much traction set one of your clutches softer than the other although with 4wd you might not need to do that. the softer clutch doesnt let the engine spool up quite so quickly, two coming in the same just sent my creation sidewards. you know it could be fun rebuilding it.......
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