Not Ranked
My suspicion is the power differences whichever way they cut are non starters because our cars are so light to start with, as others have already mentioned.
If you do not do your own engine builds once the engine is in the car, iron or aluminum is not likely to make a measurable difference. If you do, do your own builds I would rather wrestle with aluminum pieces than iron pieces.
When you go to sell your car the buyer and market will probably place a premium on the aluminum bullet rather than the iron equivalent. Premiums are real interesting critters, most people recognize them and why they are charged. Many fewer buyers are willing to pay for them.
In the end like most choices on these cars it becomes a personal decision, it is not a rational decision. What do you want for your toy?
As an aside doesn't BBM offer an aluminum block version of the FE?
Ed
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Help them do what they would have done if they had known what they could do.
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