I just picked up a Ultra HP carb, advertised to save 4.5 lbs compared to the old HP using aluminum over the pot-metal.
My aluminum Proform carb weighs way less than any Holley I own - not sure exactly how much but at least 4-5 lbs like mentioned above. Holley's are heavy for sure. Even a little 1850/600 weighs a ton. It's like putting a brick on your intake.
TQ is still the lightest by a mile being plastic and all...
