Rare Video of 503 Running
 

Re: Rare Video of 503 Running
 

That sounds awesome. Thanks for sharing! In a quick search I didn't find much on the 503. What were the power specs?

Re: Rare Video of 503 Running
 

Thanks for sharing. I'd like to hear one running a truck. I love the old truck 6s

Re: Rare Video of 503 Running
 

I don't know much about the 503, except our local Fire Truck had one. It was in an Advance Design GMC, not sure of the series, but probably one of the largest available. The distinctive sound to it was so unique that I could always tell when it was leaving the station before it even rolled out the door, never mind the siren. I believe they were loaded with torque.

I originally posted it as a video, but was told that some members were having trouble getting it to open and a Mod changed it back to a link.

Re: Rare Video of 503 Running
 

Found another.

This one has a non-original Holley Carb on it, but still sounds sweet: