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The 2.5 can only be made into a 2.9 by using the crank and carrier from a 2.7 core @ 78mm stroke. The 2.5 block is maxxed out (safely) at 89mm bore, to create the 2.7 with the 2.5 crank, or the 2.9 with the 2.7 crank.
The 2.9 is rated at 260HP and thats attained without high CR or putting the engine "on edge".
We may have the ability to get more HP as time goes on from the 2.9 combo, especially with camshaft manipulation. The limiting factor will be the hydro lifters, but our solid lift mods (that require periodic valve adjustments) can extend RPM ranges and use more aggressive cam profiles for more power.
As always, time will tell....
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Threaded Mode
