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Old 06-16-2004, 08:32 PM
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Chevy Engine 409

Can someone tell me about a early 60's model 409. Is it the same bottom end as all the other big blocks. Can I use a set of the heads on a 427 or is the engine in it's own class in the Chevy world. I can't find any info on it in any of the engine books I have, I know it was an option in the 62-63 Impala SS and things like that.

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Old 06-16-2004, 08:52 PM
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348-409

The 348-409 series engine, or "W" engine as they are called, are the predecessor to the Mark 4 big block chevy we know today. However, there are some serious design differences between them. The heads will not interchange as the early 409s and 348s used a unique block deck angle, causing the combustion chamber to be formed in the block, while the heads on the deck side are completely flat. They are a canted valve engine like the 396-427 and 454. 348s and 409s use a different distributor than a small and big block. In some instances, later style Chevy big block cranks and rods can be used, but modification is required. 348s and 409s are expensive to build, but nothing looks quite as impressive other than an early hemi. Great power potential with these early rats and alot of wow neato power too.
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Old 06-16-2004, 08:53 PM
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First, this post should have been put in the engine forum, so after I finish this response I will move it. Tranny/rear won't get you quite the same responses.

The 348 and 409 engines were Chevrolet's first attempt at the big block.
They share some things with each other, but very little at all with the 396, 402, 427, and 454.

The first 348's were originally destined for truck use, but quickly made it into the engine bays of the cars.
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