421-Inch Small-Block Makes 839 HP on Port Injection Nitrous Hit!
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hotrod.com
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 and 1963 421 SD with #980 heads in the shop now that we'll be finishing soon. We love working on these old, rare SD's and really love to hear them scream on the dyno! #ButlerPerforman
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FacebookButler Performance Pontiac
Here is a cool little video of a 421” SB2 headed engine we freshened/updated on the dyno today. It ended up making just over 880 bracket friendly horsepower! Thank you to the Marcum family for making the trip from West Virginia and trusting us with your engine needs! | Sunset Performance Engines LLC
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Here is a cool little video of a 421” SB2 headed engine we freshened/…
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