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865 cylinders (jugs) and pistons are a direct swap in a 790. I have a low-mileage set of 865 jugs & pistons available that I might part with if properly incented...
And keep your 790 cams, you'll get a bump. I believe there are 865cc bore, 10.5 comp ratio pistons available from Wiseco too, since you're in there anyway.
This would seem to be the most cost efficient route if you are on a tight budget but the 904cc TPUSA big bore kit would be the best route to go, especially for the torque increase. It is the same amount of work to intall. I have found that every time I try to cheap skate something I end up wishing that I would have done it right the first time.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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