HEI Vacuum Advance - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**samkost** · 09-20-2023, 05:24 PM

A friend came over to see the latest progress on my 72’ when he pointed out that my HEI and carburetor vacuum ports has been capped/plugged.
The carburetor manifold 3/16” port is also plugged.
Is a vacuum line needed for proper performance, timing and function?

Do I need to install a vacuum line HEI to Eldebrock?
The truck runs well but am I missing proper performance?
Truck runs well but is more power accessible with a vacuum line?

Rebuilt OE 350 V8 with Eldebrock Performer Intake, Eldebrock 1406 Carburetor and a mild Cam.
I never got model/parts numbers from the restoration shop from “Hell

“
That’s another story.

Thanks all

09-20-2023, 05:24 PM	#1
samkost Senior Member Join Date: Sep 2014 Location: Lake Tapps, Wa. Posts: 681	HEI Vacuum Advance A friend came over to see the latest progress on my 72’ when he pointed out that my HEI and carburetor vacuum ports has been capped/plugged. The carburetor manifold 3/16” port is also plugged. Is a vacuum line needed for proper performance, timing and function? Do I need to install a vacuum line HEI to Eldebrock? The truck runs well but am I missing proper performance? Truck runs well but is more power accessible with a vacuum line? Rebuilt OE 350 V8 with Eldebrock Performer Intake, Eldebrock 1406 Carburetor and a mild Cam. I never got model/parts numbers from the restoration shop from “Hell “ That’s another story. Thanks all Attached Images __________________ Sam 1972 C10 LWB 2020 Z71 Tahoe

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.