Aluminum heads with a low compression 440 will loose compression? Huh?

if you have a low CR 440 I would suggest the E street eddie (assuming you are FT cam), but get the ones with the smaller chambers. The 5090 have 75 CC. The stealth and every other cheap aluminum heads (except speedmaster which are junk and have a weird valve train) are the same castings, and they are all 84 which is not gaining you much comp ratio wise. They also flow a ton with just a little work