What's the appeal of an aluminum engine block?

[blykins]

Originally Posted by fordracing65

I believe nascar uses compact graphite iron blocks not cast iron. They are stronger than cast but lighter. They get a new engine every 1000 miles. So it makes sense to use iron. Formula 1 uses aluminum but those engines are on a different planet than a nascar motor.

Yes sir, that is correct, but that just changed with the newest generation of FR9 engines.

Up until a few years ago, they were all cast iron blocks.

Those stupid CGI FR9 blocks are like $13k a piece.