I should add to Jimmy's post of driveability, you want some good low down torque if your racing on dirt, if you are on a circuit track where you can maintain very high rpm then maybe sacrifice low down, we have spent plenty of time on the dyno getting the balance of power / driveablity right for driving on dirt
As I have said in other posts Bradz lets look at the rest of the package that you have, what carbies, diff ratio, gearbox etc. You might find your motor is very strong but other items are letting it down, a close ratio gearbox is like adding 30 bhp compared to the std escort box
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