I just put my 400 back in my truck. Went to start it it would fire and kinda run. First the carb was for a 302 so it would not run very well. I put the carb for it back on and it fired a couple times now nothing. It has spark. I thought I flooded it so I let it sit all weekend. Today no fire at all pore a little gas down carb. Nothing just cranks I'm at a loss now. Any info will help thx

 

what color is the spark tho

 

Screwed up firing order?

 

^^ This. Yellow-Red spark or, Blue-ish spark with an audible SNAP every time it fires.

 

Its a nice blue spark

 

Good spark, good fuel poured down carb, it pretty much has to run

 

unless its bypassing aka no compression , look in to timing , have u had the wires off? recheck . and make sure timing matchs top dead center in number 1 , but like tedster said check the fuel

 

I finally got it to fire again don't no what the problem was I will update when I get time to try again