Aluminum heads $ per HP?
but aluminum does allow you run higher cylinder pressure.Yes above the .480 more .490 cam you would be comparing apples to oranges.
I have found this to largely incorrect because the thing that allows you to run pump gas is a multi fold issue with the cylinder head material being a nine issue. For starters, The bottom line is dynamic cylinder pressure. Followed by timing of the ignition and cam timing events.
Someone mentioned above the lighter weight is a big deal on the 1/4 mile times. Semi true. But if you gain a 1/10th due to a 50lbs. reduction, I’d say it is more of the better flowing ports of the head helping the combo rather than the weight. Like PRH was saying earlier.
A lot is how much power your making, car weight, how well it hooks, etc.... that article you read between the iron and aluminum heads would be a good measuring tool and even better yet on various HP levels on a well sorted out car.
If a 100lbs. is a 1/10th......
For a street machine or even a bracket racer, it doesn’t matter. Run your time as close to the break out as possible consistently and you should be the winner all the time. If your running in a bracket that stops at 10.00, then that’s your target to run as close as possible. It only matters to run the time. What your running just doesn’t matter. Iron heads, a convertible, a extended van, a John Deer ... etc ...