New Edy heads, poor quality control what to do

longarm said

I sure see a lot of complaints on here about these heads.
I would not buy or pay my hard won money on a defective
or inferior product.
Buy or build what you want.
The weight savings you are looking for will not
offset the headaches of an inferior product.
On a street car, why would you ever consider running
a product that is not altra dependable.
If your heads have core shift, its probable that there are other problems
like thin walls near torque/load bearing surfaces.

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You will always see the complaints. You'll rarely read about the successes. I agree on most of what you say, especially the severe core shift issue. In terms of "no inferior product"... How would you know if you haven't done this stuff before? These heads are heavily marketed to owner/builders so it's understandable that some would be surprised at what "normal" is. I've personally used about 8 sets of big and small block RPMs over the years and the shop I used to work at probably another 20 sets in makes of Mopar, Chevy, Oldsmobile, and Ford. Plus I've used a couple sets from Indy. All aftermarket assembled heads have similar issues regardless of brand or make. Rarely are they fatal, but all will take away some potential whether it be power or longevity. My own feeling is I make sure I am maximizing the return on the expense and minimizing possible issues by spending a little more to make sure.
In terms of costs, I think a lot of us have grander plans than wallets. I know I do...lol. So we say "all that money" because we're looking at it from the one engine every couple years point of view and its a big deal. If you want the big power you have to get more air in and out. It's nice to also have modern chambers and significantly lighter weight. So you have to spend the money for better heads.
I disagree that people won't notice it. A guy that drives the car... Not cruises, but drives the car whether drag racing or on back roads should be able to notice. I can notice when I've got an extra battery in the trunk, or a full tank vs a low tank of fuel, or soft tires. To a road racer, it's vital to stay as light as you can over the front end to get the balance better. To a drag racer, it's ET drop assuming nothing else is gained by using them.