Nathan, yes that is what I am talking about. this is a common problem with some of the older cars when the throttle shafts get worn, they bind and do not let the throttle plates close completely. this leads to the detonation/dieseling when the eng is shut off. I am not saying that your carbs are worn out, only that the throttle plates may not be closed when you shut the engine off. if your problem occurs not only when the eng. is shut off, but also has pinging under load , then you probably have the problem that the others are trying to help you address.
 

Okay, and yeah it was just filmed on my phone haha.

That's kind of what I was thinking. What could cause carbon build up? Bad gas? Should I maybe run a fuel cleaner?

https://lucasoil.com/products/fuel-treatments/lucas-oil-deep-clean-fuel-system-cleaner

Says it removes carbon deposits

The instructions say for all others an ESC module is required, whatever that is.  So it seems that there might be a way to make it work if you get a knock sensor, ESC module and gauge.  If it's something you want to consider, contact the company about it.  Another, much more diy way to do it is to get an '80s or 90s gm computer and knock sensor, and whatever else might be required, along with a laptop and TunerPro RT, and you can watch the knock count in real time - you're on your own, as far as a Y-block site goes, figuring that one out.

I don't necessarily hear anything bad in the video.  Sound quality is not great.  Nothing is jumping out as bad.  What I hear sounds typical of a solid lifter engine and that is what a Y Block is.

Carbon build up increases compression, which will cause it to knock if it is bad enough.  On a new motor, that does not seem right.


Lawrenceville, GA

There's some carbon build up on the pistons, could that cause dieseling?

Just uploaded a video of the engine running on YouTube. There's kind a of tick/ping noise but I'm pretty sure that's just the stainless steel headers making that noise since the headers are capped off. It's been making that noise since day one. Had these headers on a 272 and it made the same noise.

Let me know what you guys think!

http://youtu.be/8Dxi_mMhxNU

Just read that as well Dobie

It appears to only apply to computer controlled cars per the instructions.

Oh awesome! Didn't know there was such thing. So if the green LEDS light up that's at mild detonation does that mean it's fine? Or do you not want the lights to light up at all?

If it is really mild, you may not hear it, and won't notice anything immediately.

There are gauges to monitor that, https://www.summitracing.com/parts/cei-102001/overview/.

  


Lawrenceville, GA

If you can't hear it then how do you know it's detonating? Just by the engine losing power? I have my headers plugged and the exhaust running out back