Could use some help here. I have read some other threads and timing seems to be the issue.
I have a refreshed 350 olds due to a bent connecting rod my fault before storage to much oil down the carb before it chocked out.
Here we go replaced rod , did a valve job new stock cam and chain put motor back installed 2 1/4 dual pipes from manifolds installed a shift kit all good . The mechanic said everything else was good otherwise. Paid $3000 .
fair anuf
This past summer I myself with my limited mechanical exp. Installed an edelebrock performer , edelbrock 600 carb, taylor spiro pro 8mm , bosch plugs, accel cap, rotor, coil and module . It runs great not the power of the line I was hoping for would like put a little rubber down but maybe headers will give it more .
The problem is the backfiring once in a while on start-up . If the car sits for the week I have to pump it oh 10-15 times to fire and at times it backfires , could I have a bad coil or module something else please let me know you guys are awesome here.


Thanks Eric

 

If it just backfires when you first start it after pumping the gas a bunch of times, then it's probably just the raw gas you pumped into it igniting.

First thought would be "Pump it less."

- Eric

 

I'd guess timing. Maybe It's firing back into the intake.

Set Initial to 12 degrees and see if it runs better.