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| Originally Posted by injected EDIT: I believe that the thing that stops 583's performing is the piston/valve/head combination, so pursuing performance via timing alone is going to produce small results. It would be interesting to do some research... |
Spot on, the valves and ports, together with the combustion chamber are too small to pull enough gas through to make more than about 52bhp. Fitting 620 heads and pistons apparently makes them fly!