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11 Posts
Discussion Starter #1
Just got a edelbrock performer intake manifold installed on my '86 351W. I gutted the emissions system and just need the basic vacuum lines ran when i get a chance. So far i know i need the vacuum advance line from the carb to the dist. So my question is where do i need to run my brake booster line and my line coming from the firewall for a/c controls.

Premium Member
23,549 Posts
ac controls and brake booster need full intake vacuum. so any port off of the intake runner will do.

Super Moderator
27,017 Posts
EMISSION VACUUM Diagram in a 85-86 351W Carbureted

by Chilton

acronyms (not nec. for your year/engine)
A/CL: Located in the air cleaner

A/CL DV: Air Cleaner Diverter Valve

A/CL BI MET: Air Cleaner Bi-Metallic Valve

A/CL CWM: Air Cleaner Cold Weather Modulator

ACV: Air Control Valve

AIR: Thermactor, short for Thermal Reactor. CA vehicles are installed with it as standard. Air Injection Reaction is what it stands for.

AIR BPV: AIR BPV is the AIR Bypass (AIRB) Valve; also called the TAB (Thermactor Air Bypass) Valve

BV: Bowl Vent (on top of the float tanks)

CARB: Carburetor

CPRV: Canister Purge Valve

CBD: Closed Bowl Distributor

DIST: Distributor

DV-TW = Two Way Delay Valve

EGR: Exhaust Gas Recirculation

EFCA: Electronic Fuel Control Assembly/ (Fuel Pressure Regulator (FPR)
FLTR: Filter

FPR: Fuel Pressure Regulator

HEAT VLV INT = Heat Vacuum Control Valve Intake, (next to carb)

HICV = Hot Idle Control Valve

IVV: Thermactor Idle Vacuum Valve

LCV = EGR Load Control (WOT =Wide Open Throttle) Valve)

MAN VAC: Manifold vacuum-Vacuum source

MAP: Manifold Absolute Pressure; near AC/Ventilation Systems Vacuum Tank (black plastic ball type) see pic below by Steve83

PURGE: Vapor Canister Purge Valve

PV: Ported Vacuum

PVS: Ported Vacuum Switch (PVS) Valve

PCV - Positive Crankcase Ventilation

SA-FV - Separator Assembly Fuel/Vacuum

SOL V: Thermactor Air Diverter (TAD) Solenoid (SOL V) (AIRD) & Thermactor Air Bypass (TAB) Solenoid) in mid 80's, passenger) near AC/Ventilation Systems Vacuum Tank (black plastic ball type) see pic below by Steve83

SV-CBV: Carburetor Fuel Bowl Solenoid Vent Valve

TCP: Temperature Compensated Accelerator Pump

VAC: Vacuum

VCKV: Vacuum Check Valve

VRESER: Vacuum Reservoir (Tank) in mid 80's, passenger) near AC/Ventilation Systems Vacuum Tank (black plastic ball type) by Steve83

V REST on earlier years such as SEABRONC's 83 is a Vacuum Restictor/delay valve, it delays vacuum for a certain amount of time

VCV - Vacuum Control Valve

VRV: Vacuum Regulator Valve

V CK V: Vacuum Check Valve

VOTM - Vacuum Operated Throttle Modulator

VRDV: Distributor Retard Delay Valve

TVS: Throttle Valve Solenoid (aka Solepot, Dashpot)
TVS: Temperature Vacuum Switch

TVV: Thermostatic Vacuum Valve (aka Ported Vacuum Switches)

VRDV = Vacuum Delay Valve (VDV, VRDV, DV-TW)

VDV = Vacuum Delay Valve
See my site for info on most of the above


37 Posts
There should have been a little vacuum tree type thing at the back of your old intake for the brake booster and other full manifold items. It should be the same for the new intake. There will only be one port big enough for the brake booster line anyway.
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