Thread: A little more Horsepower
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Old 12-18-2009, 06:39 PM
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FastD,
Those changes in HP and TQ were about what I got from a muffler change (double chamber restricted to 2 1/2" open), an intake manifold upgrade (performer 390 to rpm performer) and proper carb tuning (770 Holley street avenger). The difference is quite noticeable but not over the top. Just feels like the engine woke up. Sounds better too. You will be happy.

John
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