- Posts : 973
Join date : 2013-11-03
Location : Upstate NY
yeah, a 750 is HUGE for a 305. I ran a 1405(?) 500cfm edelbrock carb on my last 305 and it was plenty big enough.
I have to ask..... Are you setting the choke before trying to start it? From what you're describing, that sounds like it may be the problem. I mean no disrespect but I haven't met too many people under 40yo that know how to properly start a carburated engine, especially in the cold.
If you have an electric choke, turn on your ignition and press and hold the gas pedal to the floor for a second or two. Release the gas pedal and the choke SHOULD be set. Now start the car. Do this even in warm weather. When it's real cold, below freezing, you still might have to pump the pedal once or twice while you're cranking it over before it starts. Be aware though, with that 750cfm carb and it's BIG accelerator pump discharge orifices, if you pump it too many times while starting, you WILL flood the engine.
Manual choke? Just pull the cable's knob out to set it. As the engine warms up, a little at a time push the knob back in to open the choke up. When the engine reaches proper operating temp, the choke should be fully opened.
I hope this helps
1977 Impala Landau x1
1977 Caprice Coupe x3, Sedan x3
1978 Impala Landau x1, Sedan x2, Station Wagon x1
1978 Caprice Landau x1, Caprice Coupe x2
1979 Impala Coupe x2
1979 Caprice Coupe x7, Landau x4, Estate Wagon x1
1981 Impala Coupe x1
1983 Impala Sedan x1
1983 Caprice Sedan x1
1984 Caprice Landau x1, Sedan x1
1985 Caprice Coupe x1, Landau x3, Sedan x4
1986 Caprice Coupe x1, Landau x1
1987 Caprice Landau x1, Sedan x4
1989 Caprice Sedan 9C1 x4