Carter Thermoquads ~ 'More General Information'
here is a model 3916 Holley, 950cfm, 3-barrel carb, with 4 booster venturis,
compared to 4064 Holley, 1050cfm, 3-barrel with 2 boosters on primary, and 2 discharge tubes on secondary- comparison
they just removed the booster venturis from secondary side altogether, less obstruction, more flow, less low end response, more top end/high rpm power
here is a model 3916 Holley, 950cfm, 3-barrel carb, with 4 booster venturis,
compared to 4064 Holley, 1050cfm, 3-barrel with 2 boosters on primary, and 2 discharge tubes on secondary- comparison
they just removed the booster venturis from secondary side altogether, less obstruction, more flow, less low end response, more top end/high rpm power