Technical 354 hemi very bad to start

We have a 1956 354 hemi with 800 miles ,since a rebuild mild cam all new internals,fresh bore ,new Pistons ,reworked heads .running Barry grant tri power new when engine rebuilt .the engine runs at 185 to 195 when driving but when standing in traffic jumps to 210 to 220
300 cfm fan ,had walker radiator in but we have replaced it with a alloy radiator
Time set around 14 btdc small block water pump kit
When hot and engine stopped will not restart until cools .when cold start first turn of the key and runs ok

Help

 

Most likely either ignition failure when hot, or fuel boiling in the carburetor. With today's volatile gas most likely carburetor.

Check the spark when cold, when it won't start hot check the spark again. If it is just as good you can eliminate spark problems from the list.

Then check for vapor lock or carburetor problems.

 

What starter are you using. Running exact motor without BG carburetion Temp bumps a little in traffic, never fails to restart. I'm running a Mini starter I got from Hotheads, and cast iron truck manifolds. leave. plenty of room for circulation.

 

14 initial is too much. move it back around ten. then have 18 advance 28 total with pump gas. 30-32 on race gas.

 

300 cfm doesn't sound like enough fan

 

Also, if you havent already, you can wire a separate switch to the starter, and one to the ignition. Then you can spin it over with no spark, then hit the ignition switch......old racecar trick when running a bunch of timing and hot engines.


PS, on the wont start, does that mean wont turn over, turns over slow, or just spins?

 

at cruse it maintains temp your radiator is adequate . You have an air flow problem.
Is your fan a pusher or a puller? What side of radiator is it on. Do you have a hood? Is all the air going through the radiator or around the sides or over or under radiator.

 

Fan is a puller ,ignition is an MSD with no vac advance,turns over will not fire ,running mini starter,running with no hood or sides

 

300 cfm on a fan is not going to do much of a cooling job. Was that a typo? Does the fan have a shroud?

 

Do what rusty said.
You need to trouble shoot when it's not starting.

 

I have a 392 with a 6x2 setup and if its hot and been sitting for 5 or 10 minutes, you have to hold the throttle almost to the floor and crank it until it fires. To me it seems like the gas may be cooking and soaking the intake. But like has been said above check for spark when its hot first.