Just a quick video of some LS1 Volvo noises. Didn't even break the speed limit getting these clips!
Link to the walk-around vid:    • LS1 V8 Volvo 245L Walk-around - 1977 ...  
I took a number of different shots for this clip, and included the best sounds that I could find after a 10 minute drive. There's a few gear changes and a couple of burbles - the car runs a 3 inch exhaust system with a fake tailpipe for that sleeper look.