Porting and a cam such as a 258 or 260 would add somewhere in the neighborhood of 40-60hp.
The Rover heads are junk from the factory. There is a shit ton of meat that can be shaved off! Heads alone would add over 30hp.
I've gat a set of heads I'm going full bore with. Port and Pollish, shaved valve guides, and chevy valve springs. The chevy springs will be much stiffer and more suitable with the 260 cam at higher RPM's. In orer to fit the springs, the spring seats need to be milled aswell.
With keeping the GEM's fuel injection, I'm looking at to run about 250hp in the 4.0
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