340 has a hard time starting when hot?

agepag said

So after driving for a while, then letting it cool down (at least 1 hour) I try to start it and just keeps cranking, same as usual, i try to pump the gas, but don't want to flood it. Its really strange/embarrassing..... guys are starting there cars and leaving and im sitting in the parking lot trying to start my car!! Also don't know if this makes any difference/sense, but the engine does not have a thermostat. I was told the block was machined so its no longer there?

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You should run a mini starter no matter what. Unless it's a numbers matching resto car show deal. Even then, I'd have a mini starter sitting there and aftert he car was judged I'd put the mini starter back in. The big starters are just not that good.

What carb do you have? As Alaskan T/A said above, ethanol in the fuel will evaporate much quicker. Especially if you have a Carter/Edelbrock carb where the fuel bowls sit right over the intake manifold. Way too much heat there.

If that is what you have, you can use a plate under the carb. I think the best one is a carb cooler or something like that. I've been going to try one, just haven't got to it yet. IMO, that looks like the best option for that.

The second thing I always do, and have done since the early 1980's is block the heat off under the intake. That not only helps with what may be your situation, it will make more power.

I live in a high desert valley. So I get HOT in the summer and COLD in the winter. And I run a Strip Dominator. It has no crossover. So you can block the cross over and drive year round if you want to.

I've never ever had a carb freeze up IF, when it's really cold, you spend 5 minutes and build a bit of heat in the engine before you start to drive.