Ok been trying to get all the bug out of my big block this summer. Its about 11:1 street strip cam head work etc. I have a new battery high torque starter. Fires right up when cold. Doesnt wanna start when hot. Now before everyone gives the basics. Starter spins well even when hot. Gas lines are clear of heat. Carb has a nitrous plate under so i dont think its a heat in carb problem. It is reliable im not gonna get stranded but i have to floor pedal when hot starting. I have checked and rechecked carb everything is as it should be. I have my vacuum advance hooked to manifold vacuum(hei). 18* dist advance. soooooooo here my question im thinking of getting a box with maybe some timing control. I am a little confused on if a timing retard at start up will help the problem.

 

Or should I buy a crane hei tuning kit and start fiddling with that. The hei is stock style.

 

Sounds like it's flooding when it sits because the fuel may be dripping. Look down into the carb after it sits for a little while and see whats going on.

 

Are you saying that your actual symptom is needing to floor the pedal while cranking to get it to start when hot?

If so, then, yes, it may be flooding, but, more importantly, this is not that unusual - there are cars you need to floor in order to start, either hot or cold, and yours, being highly modified, is unlikely to start just like a stock setup.

If it cranks freely and does start reliably when flooring it, then what's the problem?

If you want to play, then just retard the timing by about 5° then next time you run it, and see if it starts easier when hot. If so, then you need to retard the timing at idle, while increasing it while running, which is to say that you have to increase the span of the mechanical advance. This generally entails replacing or modifying the weights and cross piece, and / or the springs.

- Eric

 

Uh, most nitrous plates I've seen are made from aluminum, which is a really good CONDUCTOR of heat, not an insulator. The black ones are simply anodized black (which also helps improve conduction)

 

Your right Joe, its an edelbrock setup.

 

What kind of fuel pump are you using? If its a mechanical pump with no return line that might be the issue.

 

Holley electric fuel pump

 

Just a question, what kind of dist do you have and if it has a vacuum advance where is it hooked up?

 

If you want to try retarding your timing you can just temporarily do it and save the expense of the box. You stated that your advance is connected to manifold in your first post. Did you check to see if the carb was dripping fuel? Did you check that the carb is spraying fuel if you pump the throttle when it's hot?