Got my engine started yesterday after the rebuild

Also had to run the cam in at the same which i was a
bit worried about.
After holding the car at 2500RPM for 20 minutes i took my foot off the throttle and the car died wouldnt restart

So i had to push it back in the garage at 9.30 last night

Has anyone got any ideas what the problem could be or any suggestions
that i could try?

Cheers