baxsom

after i get the car back together it has been recommended that i either go to the edelbrock 500cfm or the holley 570.

i have a question about the ports on the 570.
it has a powerbrake port by the secondary vacuum spring and the pcv under the front bowl

the current holley i am running (the little 390cfm) only has the large port by the vacuum spring. I had the powerbrake hooked to the manifold and the pcv hooked to the port by the secondaries.

does it make a difference. i would think that as long as there is full vacuum to both ports then it wouldnt but i just wanted to check first.

wrenchturner75

youll be fine. your right as long as they both have full vacum itll work.

67mustang302

The carb is set up so that the port for it's job(timing, brake etc) has the right vacuum, whether it's timed or full.