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Reply to "UPDATED - Backfire under Low RPM / Load (4th or 5th Gear)....."

I want to thanks everyone for the suggestions. Am slowly working through them.

Got some pix, and did a little work today, but it's pouring, so the drive will wait a little...

Again - the carb is a Braswell (modified Holley) double pumper, 4 corner idle.

It looks like a "31" shooter.

Accelerator pump screw is in the "2" position... But I am not seeing the typical Holley Cam in there.

I put a couple of more pix below.

Tightened (slightly) the 4 base bolts.

Only vacuum lines I have are to the PCV Valve and to the Brake booster. No vacuum advance to the distributor. EGR port (or whatever) on the carb baseplate has a good seal - now has a clamp.

Timing is set correctly (16* at idle, with "all in" at ~2800).







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