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400 is a fine engine, but you didn't say what the factory specs were, or it's original use, so I can't tell you what HP it could be, this is because that particular engine can be altered to say pull a boat, like in a truck use, or as a screamin de-stroke, 383, which is a fine street powerplant.

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Q: What is the horsepower of a small block 400?
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How much horsepower does a 400 small-block have cast number 3951509. out of a 77 4x4?

The original horsepower for a 400 small block, cast number 395-1509, was 295. The 400 small block engine had many variations resulting in different amounts of horsepower.


How much horsepower does a stock 1976 small block Chevy 400 come with?

Advertised horsepower is: 175 HP @ 3600 RPMs.


What is the horsepower rating on the 1975 Chevy small block 400?

280, to 300. NEW ANSWER: Straight out of the book. Advertised Horsepower is-175 HP @ 3600 RPMs. That engine STOCK didn't have HORSEPOWER it had torque


How much horsepower does a 400 small block with a RV cam and a 4 barrel holly throttle body fuel injection have?

it has 3.5


How much horsepower does a Chevy 400 smallblock have?

It depends on what year it was made, and what it was installed in. Chevrolet never made a high performance 400 small block. They used the 396/402 for high performance applications. The small block 400 was typically installed in heavy cars like station wagons.


How much horsepower does a 1975 400 small block have?

stock around 180hp with the 2 barrel and a little less with th 4 barrel


What is the cylinder bore on a 400 small block?

a 400 small block Chevy has a 4.125" bore.


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What year did they stop making the 400 small block Chevy?

1981 was the last year the 400 small block was made.


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