Help! Small block 360 has a knocking sound

I like the question about what does it sound like when you put it in gear. If it gets louder that can indicate an exhaust leak. Do you have any issues with backfiring at all?
I have another question, at what rpm is the engine idling in the video? Because it seems kinda fast to me. What is your manifold vacuum at idle and rpm?


Nope, no backfiring issues at all. I believe it was idling a bit high, but I don't remember what the tach said. I believe the vacuum at idle was around 20 Inches last time I checked it.