You had me at: [QUOTE=ITMerc;886021]I've been working with Hennessy to build a special 'built' block HPE650 with my Cyber Grey 2010 SS with all the normal stuff they put on their HPE650 PLUS: a forged/balanced/lowered compression/coated internals stroked 415 CID block, twin disk clutch, full Pedders Track Extreme suspension kit, Baer Extreme Plus 6 piston brake kit, 20" HRE P43 Monobloks... and too many tech details to go into.
Its being badged a 650 primarily because their 700 is an LS9 and the 800 is a twin turbo! Heh!QUOTE]
LOL!! Sounds very nice man.
You should be able to pull a couple more horses with the higher octane. What tubo are you running and how much boost will you be running?