Aluminum Vs. Cast Iron Engine Blocks. While iron engine blocks are time-tested and race-proven, aluminum is the preferred metal for many racers. It does have many …
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Iron block vs. Aluminum block 5.3. This is a discussion on Iron block vs. Aluminum block 5.3 within the Performance forums, part of the General Discussion category …
Jul 10, 2012 · The aluminum block is lighter while the iron block is stronger. I think the aluminum 5.3 is only gen IV while the iron 5.3 can be either gen III or gen IV.