So i recieved all my HSR stuff for the swap. The engine is completely redone, basicly just reused the block. But i have an HSR question....the back of the plenum has a few threaded holes in it. I know these are for vacuum lines but the old fittings do not fit? What do these lines run to and what size are the fittings i need to obtain? I have looked at a few parts lists that contain parts needed for the swap WITH part numbers and none of the lists have fittings included. There is no mention of fittings and i also tried searching. Im getting ready to install this engine within the next 2 weeks and really need to find out what these ports go to. Please help!

 

There should be 2 larger 1/4" ports and two 1/8" ports on the rear, plus one I think it's 1/4" on the bottom of the plenum. I just bought (2) 1/4" and (2) 1/8" pipe thread-to-barb adapters from NAPA $1 each. I have a MAF so this is how I arranged it.

1/4" bottom of plenum- PCV hose
1/4" rear- MAT sensor
1/4" rear- Brake Booster hose

1/8" rear- Fuel pressure regulator
1/8" rear- a "t" is plugged to it, one goes to cruise the other into the pass side firewall (not sure where it terminates perhaps HVAC control.)

 

i dont have cruse or any vacuum controls of the kind. i went with the fuel lines that have the fuel pressure regulator already on them from holly. figured that was the wise way to go since i needed a regulator anyways. ill have to go pick up some fittings sometime this week now and see what i can come up with. thanks man

 

Every regulator I've seen is vacuum assisted, a vacuum line is ran from the AFPR to the plenum. You can run without it but may be lean at high rpm, just be sure to plug any threads you dont use. I put silicone on all the threads to prevent leaks.

 

you still have to connect a vac line to it to make it function properly. - Do you still have power brakes? If so, then you have to tie the booster line to one of the ports. Otherwise, pcv, and if you've eliminated the cruise and a/c, then plug the rest.

 

i forgot all about the vacuum to the regulator lol. ill use teflon tape for the threads. i might swap ac into the vehicl but prob not till next year when i can round up all the controlls and lines. once i get those fittings i think im all set