Hard starting when hot - vapor lock?

[mln385]

Have you tried leaving your cooling fan on for a few minutes after shutting it down? I had similar issue early on and on real hot days I let the fan run for a minute or two before I walk away to get all the heat out of the engine bay.

[bamared]

ive had the same issue on a few engines. timing was to advanced and was hard to start when hot. but that made hard starts cause the engine didn't want to turn over. haven't read if thats what is happening to you or not.

also, had one that the starter was getting heat soak. and it didn't want to start when it was hot too. also hard to turn over. i guess if your not having a hard time turning the engine over, than this isn't your problem.

another thing i would check is this, take it for a good ride, get to operating temps, and normal driving.
when you get home before you shut it off, pull the filter off the carb, and let it idle.
then, shut it off and look down the carb and see if your getting fuel leaking down the bowls. had that happen a few times in my 414w in the cobra.

[CHRIS DAMSCH]

I chased a similar issue in my SPF all summer. I was left stranded more than once. I finally narrowed it down to the msd 6am was intermittedly working. The car would start fine cold and run for as long as you wanted until you **** it off. It wouldn't restart until it cooled down for hours. Finally the last time it just never restarted.
When it won't restart, check for spark(when hot). This drove me crazy all year. Put a new box in and it starts easier than ever before. Makes me wonder how long the box was acting up.

[gsharapa]

All good suggestions from all posts. I had simlar concerns with several of my past SPFs. One with 514 was the worst. Went to 1/2 inch fuel line, aluminum thin spacers under the carb, regulator and line off the block which fixed the concern. One car I did put a return line on which did keep the fuel moving throughout the system and keeping it cooler. That car had an Aero Automotive fuel pump and regulator also.