Hey guys so I was working on my truck last night and ran into a little problem. I just rebuilt my 255 ( i know no flaming for keeping the stock motor please) and was trying to hook up everything back up. When I took the motor out I drew a diagram of the vacume hoses cause I knew that is the only thing I would have troubles with. The problem is that I lost my diagram. I have all the smog stuff removed and keep in mind it is the same externals as a 302. I have a motorcraft carb ( dont know how to tell the difference between a 2100 and 2150.) I ran the vac adv on the dizzy to the front of the carb and the pcv to the rear drivers side and the brake booster to the vacume tree on the rear of the intake. Where does the tranny vacume go? Is there any other vacume lines I need to have on here? Also on the rear of the intake there are 2 fittings/valves with 2 vacume ports each look like the run through the coolant passage but not 100% on that, what are these for and can I just plug them. And on the back of the carb on the passenger side there is a vacume port that looks like it was hooked to something does this need plugged too. As always guys thanks for any help you can give. Btw please do not refer me to the vacume diagram on the sticker.

Thanks,
Nick

 

You should have a plastic vacuum block mounted on the firewall behind the engine. There should be a vacuum line going from the intake to this "tree". I have seen the HVAC vacuum line hooked to this tree, and also the tranny vacuum. It really doesn't matter where the tranny vacuum is hooked up, so long as it's manifold vacuum.

Those plastic things screwed into the water jackets on the intake are vacuum switches. If you have disconnected everything, then there is nothing for them to switch, so you can just leave them alone. If there are no vacuum lines going to them, then there is no need to plug them either.

 

You should have a plastic vacuum block mounted on the firewall behind the engine. There should be a vacuum line going from the intake to this "tree". I have seen the HVAC vacuum line hooked to this tree, and also the tranny vacuum. It really doesn't matter where the tranny vacuum is hooked up, so long as it's manifold vacuum.

Those plastic things screwed into the water jackets on the intake are vacuum switches. If you have disconnected everything, then there is nothing for them to switch, so you can just leave them alone. If there are no vacuum lines going to them, then there is no need to plug them either.

 

Thanks Franklin that is what I needed to know. On my intake it has a vacume tree screwed into the intake itself and there is no a/c on the motor so no worries about that. Thanks man.

 

I just remembered one other question I have. On my fan (w/o clutch) the blades are not evenly spaced out is this used as some type of external balancer or is it balanced itself? The blades are not bent it was just made that way.

 

Yes it is somewhat of a balancer. It has more of a smooth operation.