Help! Can't figure out the backfire issue on my 440 hemi....

[wes473]

  Well my boy and I sorted through the old parts bins thoroughly and found enough MoPar to build a custom 440 Hemi drag car!  We've had a heck of a time getting it to run right tho, flames seem to be shooting everywhere when we try to start it despite our best efforts to tune it. Being a full custom build, where should I start problem solving? 

[Filthy Filbert]

You need to advance your spark timing.  It's lighting off too late, and the fuel hasn't completed its burn before it's getting dumped into the exhaust.   

You'll notice a big jump in power too, because advancing the timing will build more pressure in the chamber, producing more torque.

[torredcuda]

Distributer 180 out, or is that beast running a mag?

[BIGSHCLUNK]

 

[tparker]

Uhmm... I think you got serious problems. It appears you have flames coming out of the spark plug holes. I'd recommend fixing that first then get back to us. 

[Mr Lee]

HAHAHA!  Took me a minute to catch on and then was literally laughing out loud.  That's great!   

[Mopsquad]

Blower belt.

You might find a replacement here:

https://www.grainger.com/product/13R311?ef_id=Cj0KCQjw3IqSBhCoARIsAMBkTb1yFDNWMkjisZIlXGBrmeLG0SFybC6NWt5xVw-Jm4P-NtQMfYy8-y4aAnV9EALw_wcB:G:s&s_kwcid=AL!2966!3!264955916096!!!g!438976780705!&gucid=N:N:PS:Paid:GGL:CSM-2295:4P7A1P:20501231&gclid=Cj0KCQjw3IqSBhCoARIsAMBkTb1yFDNWMkjisZIlXGBrmeLG0SFybC6NWt5xVw-Jm4P-NtQMfYy8-y4aAnV9EALw_wcB&gclsrc=aw.ds

Hope you get it figured out

BTW: best post of the month.