Every casting# big block head has the potential for some impressive gains.
Is it worth it is where the debate usually arises.
For many the cost of machine shop labor and the benefit of shedding some
pounds off the nose of their car with aluminum heads is the deciding factor.
For a guy who has more time than money and doesn't mind putting in the
effort it can be very rewarding.
First set I worked I got to close to water and after a 1000 miles or so had to work another
head. They make as much power as the aftermarket standard port sized offerings.
I think they were worth the effort.