Heavier than heck. Uglier than dog poop but Tom Hemphill told me they work pretty good. I sold mine as he said the single 4intake works good too

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time