4K views · 212 reactions | 421 SUPER DUTY ON THE DYNO @ Butler...
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4K views · 212 reactions | 421 SUPER DUTY ON THE DYNO @ Butler...
Butler Performance Pontiac. . 421 SUPER DUTY ON THE DYNO @ Butler Performance!! This 421 SD is using the early "306" heads. These flow a little less than the 1962/ #127's and much less than the 1963/ #980 heads, but it still made great power. Almost 500 HP and well over 500 ft.lbs. of torque!! We actually have both a 1962 389 SD with #127 heads ...
4.1K views3 weeks ago
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