My brother just built a 400 small block using the stock LT1 computer, intake, heads, etc. It ran fine for about 2 hours. It then stalled and now nothing. We checked for spark and fuel and it has both. Where do we go from here? I mean seriously, what causes it to just die and not refire after it ran so good? Any help would be great!

 

an engine will run if the facts are complete. F=fuel, A=air, C=compression, T=timing, S=spark. if all are present then i would think it would be electrical.

 

if it's turning over but not starting I would check your opti. Just had to same problem and it turned out to be the opti.