Thread: Standard vs H.O/Ram-Air Exhaust Manifold
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Old 07-18-2004, 02:28 PM
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b-man b-man is offline
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On a stock 400 you'll gain about 10 HP at the most, probably twice that much with a better cam, etc.

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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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