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a 600lb lighter package is an appealing combination.




It does sound appealing, but it isn't going to happen

Go pick up a 5.7 bare block sometime!



Why won't it happen?

From what I can find via Moparts and Google, the weight of a 5.7 hemi is just under 500 lbs. The 440 with cast iron heads/block/intake is just under 700 lbs.
And on top of that, my B body currently weighs 3600 lbs with the 440, and a stock LX sedan weighs 4050.

So if the 70 model is already 400 lbs lighter than the 08, and the engines have a 200 lb weight difference, the 5.7 should outperform the 440 in every aspect. Reliability, lighter weight, power, etc.

The main reason I want to do the swap is because I want it to be a better rounded, more reliable, efficient car. I don't really want to build the big block, as then I'd have to face 100x the maintaince, fuel economy, worse handling and braking, etc.