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tim_mc · 02-22-2024, 10:01 PM

I echo all that have mentioned a fuel regulator. Edelbrocks like 4-6psi of fuel pressure. I had a 1405, now an AVS2. With no regulator, it will run too rich and load up at idle.

Also, when fully warmed up, that's when stuff expands, so it could be a vacuum leak or fuel boiling when warm. I use the Edelbrock 9266 carb insulator to isolate the carb since aluminum conducts heat (too) well.

Likely not related, but my truck was stalling at stops and loading up. I was CONVINCED it was a carb issue. Turns out I had a weak spark from my Delco HEI. I changed the coil and module to Davis Unified Ignition (DUI) and WOW. Exhaust burns clean, great idle and no issues since. Thread for those interested:

https://67-72chevytrucks.com/vboard/...d.php?t=822473

02-22-2024, 10:01 PM	#13
tim_mc Registered User Join Date: Jan 2019 Location: St Peters, MO Posts: 434	Re: Carb Adjustment Question I echo all that have mentioned a fuel regulator. Edelbrocks like 4-6psi of fuel pressure. I had a 1405, now an AVS2. With no regulator, it will run too rich and load up at idle. Also, when fully warmed up, that's when stuff expands, so it could be a vacuum leak or fuel boiling when warm. I use the Edelbrock 9266 carb insulator to isolate the carb since aluminum conducts heat (too) well. Likely not related, but my truck was stalling at stops and loading up. I was CONVINCED it was a carb issue. Turns out I had a weak spark from my Delco HEI. I changed the coil and module to Davis Unified Ignition (DUI) and WOW. Exhaust burns clean, great idle and no issues since. Thread for those interested: https://67-72chevytrucks.com/vboard/...d.php?t=822473 Attached Images __________________ 1967 C20, 350 SBC w/Comp roller cam, 700R4 w/3.42 posi, PS, 4-wheel PDB, Old Air AC & GM Tilt column. Last edited by tim_mc; 02-22-2024 at 10:23 PM.