No idle on cold rebuilt engine

[Olle B]

HI
I have a minor problem with my totaly rebuilt 383 HP engine.
When engine cold I have no idle at all!!
It startas a dream,,,even if it make some tappet noise (wiew my Q concerning that part!!).
BUT it have to go for more than 5 minutes before idle at all!, after that period of time it starts and idle well!!
I run the engine without choke as I did last season with my worn out engine, I used a Carter by that time and it was more tricky to start but it idle fine after 1-2 minutes!
Now I have a rebuilt original Holley also without chokeassy.
I also blocked the heatchannel under intake,,, does it have any effect even if I havent any choke?
� think I will mount a wire to control the choke,,,,or do you have any tip or idea why it take all that time to make it run by itself,
If I lower pedalpressure and go down to 1500 it dies directly when cold,after 5 min it idle fine at 1000!!

Thanks and best r Olle

[Bill55AZ]

Blocking the heat channel may be your mistake. It allows heat to get to the base of the carb. quicker so the fuel atomizes better. I had a clogged channel once that actually caused ice to build up around the base of the carb. in winter time in Idaho.

[Bill55AZ]

And, yes, definitely hook up the choke!

[dave571]

Lot's of guys block the channel on performance applications. It may be part of ther problem(like bill55az said), but put a manual choke kit on first.

The choke kit is a lot less work to try, and even if the cross over is a factor, you'll get some sort of idle out of it.