Houston_t

iTrader: (2)

What are you guys doing with the 3/8" npt port in the intake ?

RabidStreetRacer

iTrader: (1)

I have one going to the vacuum line on the carb and the other will be for a MAP sensor.

Houston_t

iTrader: (2)

Just thinking out loud here but shouldn't the carb already be getting vacuum from the intake if its sitting on top of it ? Not saying your wrong just thinking.

Pop N Wood

iTrader: (1)

I think that might be there for a PCV port. Most builds just seem to plug that off.

Make sure you put sealed screws in the holes for mounting the box. They go through and will cause a vac leak if they aren't blocked off.

I have a PCV and brake booster hooked to the back of the carb and the MAP sensor hooked to an unported vac nipple on the front of the carb.

ZONES89RS

iTrader: (25)

I use the 3/8 for my brake booster.

RabidStreetRacer

iTrader: (1)

I got the carb info from an old guy at NAPA, he gave me some bad info. I got my old Holley book out and looked it up.

Carb ports
Large Port on back of carbCV hose/brake vacuum hose
Vacuum port in R/side of carb metering block: Timed vacuum port for vacuum advance
Vacuum port on R/side of throttle plate: Full time vacuum for auto trans

Vacuum on Intake can also be for auto trans