Put some of this in a different thread. I’m going to list what I have, what I did, and what I’m going to do. My main question is how much to throw at the problem at once? Not a huge fan of taking apart the carb multiple times if I can help it.
I have a 17057213 on a 350 SBC in a 1977 Sierra Grande. Initial timing at 12 btdc, haven’t addressed full timing yet.
Rebuilt the carb using an Oreilly kit that Cliff told me in a prev thread is likely part of the problem. The kit was basic and I didn’t replace the float, rods, or jets. I used carb cleaner and flushed everything out with compressed air but didn’t stick wires in any holes. Also replaced my distributor cap and rotor, which is good, but added new weights and springs which Cliff explained probably added to the problems.
So here’s my plan. Get Cliff’s rebuild kit, probably the HP one so I have all the pieces. Rebuild the carb again. Put back the factory weights and springs in the distributor. Put it all on the truck and set up the carb according to basic tuning principles.
The off idle stumble I have is pretty serious. It often just dies unless I hammer on the throttle. Usually the best way to go is to let it get some momentum while in drive with no throttle and then to hit the gas. I’m wondering if while I have the carburetor taken apart if I should fiddle with jet size? I understand the basic principle of the stumble is a lean condition and I’m chasing down the cause of it. I’m not sure how much to throw at that particular issue.
