The challenges with aluminum blocks (Euro mainly) with higher silicone content and special prep for the cylinder bores is largely solved by sleeving the blocks with iron cylinder liners -- most OEM stuff has come that way for quite some time.
As a comparison - the 376 cube LS3 (alum block/heads) in mine weighs 70 lbs. less with a 9.2" deck height than a cast-iron head/block 302 cube Ford with an 8.2" deck height. It weighs about 140 lbs. less than a cast iron head/block 351 Ford with a 9.5" deck height. By moving the battery to the trunk and putting lighter weight bumpers on my Volvo, the total weight and front/rear distribution is pretty close to what it was with the original 4 cylinder. A bigger difference occurs when a passenger is in the car than with the engine swap. So I'm a big fan of the all aluminum V8 I chose.
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