chevrolet21

Alryty mucked round with the mixture screws on carby and with the screws wound out 1.5 turns it idles at 1500revs and i cant adjust the idler screw any less. so mixture screws are only wound out half a turn to keep the rpm down maybe mis timing now? Also replaced all spark plugs a year ago and are oily again so thinking the valve guides are probably worn rather than running rich?

Aw ok the carb is a holley 4brl with the number 4548 stamped on it if that helps any one cheers

Hi there I have a 1986 camaro with a 305 in it and am having a few problems with it. Originally was a tpi but now carby. For starters it seems to run hot iv replaced or reconded everything ie waterpump,radiator and hoses,water pump, thermostat and put an extra electric fan on it. It runs a 82degree thermo but temp seems to creep up to 100degrees even on a cold day and very close to boiling on a hot day.Any ideas? Also sometimes when the motor is warm it can be hard to start and sounds like like a flat battery but after a few winds it fires straight up? another question when i fire it up cold or hot or give it a quick rev from idle it smokes a black puff out but when running doesnt smoke at all and doesnt use any oil just wondering what is worn to cause that? Cheers for looking and any help is much appreceiated cheers