Thread: 429 or 460?

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being that the 429 and 460 are the same block, the build will be the same no matter what. Your running a C-6 and a 9" so go with the 460. There is no replacement for displacement.

All things being equal, I agree the extra 31 cubes make for a better choice.

Don

Kind of the way I'm thinking too! The extra inches don't hurt, and it is the same block, so all the peripherals will work either way as said above. Actually the 460 is a little cheaper to build, and lower compression is a plus with todays gas!

Tell me if this make sense. I'm using a computer program horse power simulator. Running equal components from heads, carb and cam the 429 ends up with about 50-60 hp, every time I run the figures, compared to the 460. I'm using Camquest 6 software from comp cams web site! The only thing I can think of is the smaller cylinder volume increases the compression and therebye the Horsepower. I just assumed the extra few cc of the 460, would equal extra horse power.

Originally Posted by stovens

Tell me if this make sense. I'm using a computer program horse power simulator. Running equal components from heads, carb and cam the 429 ends up with about 50-60 hp, every time I run the figures, compared to the 460. I'm using Camquest 6 software from comp cams web site!

As to whether or not this "makes sense," my reply is that it makes sense only because it's a computer program. Of course it's wrong; you are playing with a computer program and not an engine build or even an engine combo of any kind.

Assuming all components being equal (including compression ratio) the 429 and 460 engines will make about the same power, the 429 generating that power at a slightly higher rpm than the 460.

Originally Posted by stovens

The only thing I can think of is the smaller cylinder volume increases the compression and thereby the Horsepower. I just assumed the extra few cc of the 460, would equal extra horse power.

The fact that the 429 has a lower engine displacement will make its compression ratio lower than the 460, not higher.

You will be very, very restricted in performance piston choices if you build the 429. Which engine you ultimately build depends on application.

Paul