750 Mechanical secondaries 

The Street HP uses the best features from Holley's race Bred 4150 HP carbs, but tamed for street and light competition use. 
The contoured main body from the 4150 HP has a tumble polished shiny finish. The metering system includes a timed spark port for a vacuum advance distributor and is calibrated for a hot street/strip engine setup for outstanding throttle response and drivability. A street HP base plate is used so there are plenty of vacuum ports for power brakes, PCV, etc. 


Features 
Mechanical secondaries 
Dual accelerator pumps 
Adjustable air bleeds 
No choke 
Contoured venturii inlet for increased airflow 
Four corner idle for precise idle control 
Dual feed fuel inlet 
1 timed (spark) port, 1 full vacuum, and 1 PCV port 
Intended for lightweight vehicles w/ manual trans or automatics with high stall & low gearing 
Street/strip calibration for outstanding throttle response & drivability 
Ford A/T kickdown, does not work with A.O.D. transmissions