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All things being equal, the small cam NHH220/262 is not as good of an engine as the big cam NHH250. For one thing, the head design was changed making the newer engine less prone to head gasket leaks. In addition, the big cam engine can be hot rodded to much greater HP than the small cam. For the small cam, 262 HP is about the top of the charts. For the big cam, 300-350 HP is possible.
The majority of Crowns left the factory in the later years with the DD 6-71T which was rated at about 250 HP. The odds are pretty good the third bus has the DD.
The DD is a very good engine but the 2-cycle engines just don't put out the HP as well as the 4-cycle engines do. The 6-71T can be hot rodded but about the most you will get out of one is 275-300 HP. You will also start to have problems with overheating.
Good luck and happy trails.
Mark O. |
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