[johndewaele]

74 Spyder with Webers - I recently replaced the head after a valve job etc. The car runs fantastic; never better.
When I shut the car off, after 2 or 3 seconds, I get a pop out of the exhaust.
Any thoughts?
Thanks in advance!

 

[flivesay]

have you checked the float level and control? might be leaking down or set too high

 

[radamm]

For whatever reason, there is too much fuel and heat in the exhaust.