why not use a 998cc testastretta engine with 102 mm pistons -> 1038 cc
I did mine last year - works perfect 
I think the dynograph still is on the forum somewhere
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Ducati 998S (roadbike)
Pistal HC 102 mm pistons
Lightend and balanced crank
42 mm intake valves
Ported heads
57 mm full titanium LeoVince SBK
Edo Vigna Racing Large airbox
Flywheel less 1,6 kg
Ducati 999S (Trackbike)
60mm full system from Sil Motor
58mm Throttlebodys
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