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**Rich72C10** · 10-25-2021, 04:01 PM

there are other ports but they aren't FULL vacuum. The progression ignition requires full vacuum, full stop.

The one on the side by the choke, I have always assumed was ported too. I suppose I should hook up my vacuum gauge to check it.

My '78 Qjet had more ports, one of which was full vacuum on the front (not including the normal one for PCV).

Edit: I suppose I should check each capped port with my gauge, so I am not spouting off lies!

10-25-2021, 04:01 PM	#8
Rich72C10 Mr. Cheyenne Join Date: Jun 2020 Location: Kyle, Texas Posts: 1,643	Re: progression ignition there are other ports but they aren't FULL vacuum. The progression ignition requires full vacuum, full stop. The one on the side by the choke, I have always assumed was ported too. I suppose I should hook up my vacuum gauge to check it. My '78 Qjet had more ports, one of which was full vacuum on the front (not including the normal one for PCV). Edit: I suppose I should check each capped port with my gauge, so I am not spouting off lies! __________________ Richard *'72 Chevy C10 Cheyenne Super WHT/MED BRONZE/WHT SBC 350 \| TH350 \| LWB \| AC \| Buddy Seats Upgrades:** Tilt \| Front Sway Bar \| Radio \| Sliding Window \| Bed Spare w/Lock Bed Rails \| Full LEDs \| Courtesy Lights \| Tachometer \| Glovebox Lock & Light \| Head Light Relays \| *Upgraded Fully Super Trim