thanks guys, I'll probably give it a shot just because I have it. I am building a 390 to replace the352 at some point. The alum. is 15lbs. lighter, but the blowproof bell is 10lbs. heavier, so not much weight savings.the 62 has a crites glass front clip & bumpers & offy alum intake, so I'm always looking to save weight. I've had a few 352 cars & this one runs nice. 4 speed & 389s should make it bearable. Next question, anybody have experience with sanderson shorty headers? car does have ps. thanks

ps. i'll try to get a bio together soon.
ps.ps. I googled Harvey alum. It seems they were the foundery for schiffer and those flywheels were prone for the steel friction surface to separate from the alum. body. seems the surface was spray welded onto it.
back to the steel I guess.