ok i know i asked this question a lil while back but here i go. where can i hook my vac. modulator to? i know there is the port behind the carb. but i got my pcv running to there. now a new part of the question. can i put a T coming out of that port and run the pcv and the vac. mod. to there or should i find a fitting with two ports on it? what would be the best way. i do not see anything else that would be vaccum on the carb and manifold. its a holly double pumper if that helps. thanks - Jon

 

i'm not a 100% but isnt the pcv supposed to be hooked up to the carb so it can burn the fumes from the crankcase.if you have that hooked up to the port behind the carb coming off the intake your doing nothing but recirculating the fumes.hook the pcv up to the carb or most aftermarket air cleaner housings have the hook up on the bottom of them to hook the pcv line up to then you can hook the modulator line where its supposed to go

 

yeah i just went down stairs to double check and there is nothing on the bottom of the air cleaner to hook it up to. and there is nothing on the carb. not a port not a nothing. well there is one for the distributer. but thats all i can see. so confused

 

you can take the pcv out and use a breather in its place.let the fumes vent to the atmosphere

 

yeah i could but the fuems come up and smell bad and hit you in the face. i wanted the pcv so it would not smell as much. you know what i mean? and do they make a fitting with dual stems coming of it? thanks

 

Whoa guys! The PCV cannot be connected to the air cleaner, it needs a solid vacuum source so it can scavenge the gases and moisture from the crankcase. The opposite side of the engine as the PCV is where the breather goes, that can and sometimes is connected to the air cleaner (usually from the factory). The breather was connected there to allow filtered air to go into the block. Most rodders do away with this and get a push in breather that has a built in element to filter the air.

Vacuum ports: Your carb should have one or most likely two in the front. One port only has vacuum when you raise the engine speed just above idle, this is for your vacuum advance on the distributor. The other port should have vacuum 100% of the time, this can be used for the modulator. Do you have power brakes? If so I assume that hose is connected to the manifold behind the carb?? If that port has only one connection locate one that has two. GM made these for a number of years and are easy to find. One large port for brakes or PCV and a smaller one for modulator.

 

yeah i know what your talking about. but the problem is i got the one in the back of the carb is hooked for the brakes and the other for the distributer. than there is the port in the intake manifold. i know i need a constant vaccum source for the modulator. but i also need one for the pcv. thats the delma here. i hate it

 

Tee the power brake line as close to the manifold as you can. The only thing I would be careful about is I would not use a plastic tee. They can get brittle and break and you may lose braking power at a bad time.

 

so run the pcv to the brake booster line or the modulator??? thanks for the advice guys

 

Sorry... Tee the modulator into the brake vacuum line. The PCV would take away too much vacuum from the brake booster.