Depends on which big block, what vehicle it is installed in, and the speed you are driving.
For carbureted applications, up to 7 lbs. Most stock pumps rarely put out much over 4 lbs.
Assuming you are asking about gallons of fuel, it holds 17 gallons of fuel.
The Fuel tank holds 16 gallons
19.6 gallons
16.3 Gallons
Gallons of what? If you are asking about fuel tank capacity, it holds 19 gallons.
stock: 10 gallons
31 gallons per owners manual
31 gallons main fuel tank.
22.0 gallons
26 gallons
Roughly 13 gallons