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
16.3 Gallons
19.6 gallons
stock: 10 gallons
Gallons of what? If you are asking about fuel tank capacity, it holds 19 gallons.
31 gallons main fuel tank.
On a 1982 Chevy Citation the fuel pump is mounted on the lower engine block.
31 gallons per owners manual
28 gallons
42 gallons