Need help with the jets and metering rods for a 305 chevy

[Cliff Ruggles]

Correct, it should be fully applied within a second or so.  If not, it may be plugged up, or leak in the diaphram.  I would replace it if it still applies slowly after putting a new rubber hose on it....Cliff

[jamon8]

I put on a new choke pull off and it is starting like a new car. I also had the electric choke set way too tight. thanks for all the help

I have one more issue that needs attention before I can call it done. if I start it up and drive it right away without it bieng warmed up all the way it pops through the carb. after it has warmed up it does not have a problem. backfiring through the carb is usually a sign of retarted timing but I have the timing as far advanced as you can get it without spark knocking. also if you goose the throttle when its cold it will back fire through the carb

[Cliff Ruggles]

If the timing is adjusted correctly then it's too lean, and/or the intake is too cold.  This also assumes no other issues like bad plug wires, spark plugs, low on compression, broken/weak valve springs, etc......Cliff

[jamon8]

well I did a compression check and the motor is ok, all the plugs look like they are firing so its not the plugs or the wires. just for fun I advanced the timing and it seemed to run better and did not spark knock. I think that the timing chain is stretched out. I will never use summit brand parts ever again. I had a problem with thier intake manifold and now the timing chain has stretched dramatically. I will try it again in the morning when it is nice and cold

[Cliff Ruggles]

Did you install a "roller" type timing set?

I use and prefer the stock link-plate sets.  For small block Chevy engines we use the 3/4" wide set, still available at most auto parts stores......Cliff

[jamon8]

yes it was a roller. I am also putting a curve kit in the dissy so that it advances earlier