Hot starting question

oldkoot said
With the air cleaner on or removed it acts the same. If you don't touch the gas, it cranks over but won't fire, you would almost think it was flooded but when you look into the carb the butterflies are dry. I've also pulled the plugs to confirm and they are dry.If you give it a pump of gas but don't hold the throttle open the same thing, it won't fire. The fuel line and carb body are not hot enough that you can't hold your hand on them.The idle speed is set for 600 in drive so the throttle blades are not open very far, that's why I'm thinking it needs to draw more air.

I observed the same thing on my buddies Chevy pickup and my Cuda except my idle is set at 800 in drive due to the large cam. My buddies 454 is set at 650 in drive. At one time I also had 1/32 holes drilled in the primary butterflies to try to get it to idle better but that caused it to run rich off idle so I replaced the butterflies with new ones. It does the same no matter what butterflies were in it. When I first put my car together I thought it might be electrical but I checked and it fires right away. Just don't start unless you hold the pedal down some. When it was cold out it didn't do it. The hotter it gets the worse it is. I can't try an insulator on mine because I have no hood clearance as it is but we did try one on my buddies truck and it made no difference. Also note my car has an electric fuel pump also so I'm sure the bowls are not dry when it's warm. I can't come up with an explanation other than it may be fuel formulation.