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Depending on how it's built a 400 cu in small block Chevy can reach two hp per cu in in forced induction form ( blower , turbo). That's 800 ponies ! In carbureted form (whether it's duals or just a big single) 1.5 hp per cu in can be attained if the right parts combination is used. 600hp. Most well built small blocks running around on the street , pump gas motors , will be in the 400hp range if they're lucky and tuned right. Even 300hp can be a bunch of fun with the proper set up. The new Camaro 6 cyl is rated at 300 and I imagine is a blast to drive. Don't be fooled by the Dual carb set up. Two are not always better than one, rarely are two carbs NEEDED. Yeah they look cool but making more than one carb work can be a challenge (and a headache). Just adding a carb to your motor won't do anything. It's ALWAYS the right parts combination that makes power. Certain parts can go a long way, and some are just a noisy waste of money.

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Q: How much horsepowr from a 400 smallblock Chevy 400 with duel carbohydrates have?
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