Companies, such as World Products and Bob Walla Racing, offer new aluminum blocks based on the original W. But if you’re looking for an engine to build, old iron blocks are not the only option. If you’re restoring an Impala or another Chevy car or truck with a rebuildable block, you already have the foundation for your engine build. Original 409s are highly coveted and a decent block often sells for about $5,000 while the 348s are much more abundant and often go for about $1,500 in rebuildable condition. On top of that, rebuildable 409 blocks are hard to find and getting more expensive all the time. The bad news is that most were built more than 50 years ago and are showing their age, and many original blocks have been rebuilt several times. The good news about 348 and 409 blocks is there were more than 18 different Chevrolet W-engine factory blocks built from 1958 to 1965.
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