I've just moved to Vegas with my 79. The issue I've been having is when it gets hot out, and the engine really heats up the engine will lurch and stutter when I lay into it too much. Originally I figured it was an issue with it not getting a spark, or enough spark, but talking to some of the local out here I've been told it could be the exhaust causing the gas to boil. Without any of the tool or expertise I had back home I'm stuck with trusting a mechanic. Just wanted a second, non-biased opinion or the matter from someone who surely know the car better than I do.

 

I've heard of that on more than one occasion.

A lot of times it will fill the bowls up with boiling fuel and not be able to fuel correctly. In some cases, a fuel cooler may be needed like on the newer diesel trucks

 

Yes, could be the gas is vaporizing in the fuel line from pump-to-carb.
A quick fix can be wooden clothes pins on the tubing for dissipating heat,
and/or wrapping fuel line with pipe insulation.


Another fault may be the coil in cap getting too hot, exchange coil or use another cap with coil when it happens. You might drill some holes in cap for flowing of cooler air through it.

 

I've had that happen, where the carb was getting too darn hot, and the gas would perk out of the bowl faster than it could fill up. One thing you don't need/want on a hot weather car, is the stock setup that cross-flows hot exhaust beneath the carb. Great for heating it up in winters, not so good at all in hot weather, which is what you may be finding out. Blocking those ports off requires removing the intake manifold though, and installing the block off plates. A bandaid fix would be using a phenolic carb spacer, which will help cut down the amount of heat that transfers to the carb.