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Mike Kara's on j-body.org has a built 2.4 with an H.O. intake and a mild ported head which dyno'd at 410HP and 405ft-lbs of torque when running 25psi, and he was using 93 pump octane... of course that was with no exhaust, with a full exhaust system that went down to about 360HP...
He also has a TEC2 or TEC3 system to do all the tuning, an expensive setup but I guess it paid off... :P
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