There were a lot of small inch SBCs used in the lower Modified Production and Gas classes in NHRA and IHRA competition. These were often 265s and 283s that were actually destroked to bring the displacement down. They were high winding, screaming banshees and 10k RPM was not out of the question. Many of them were using gears as low as 6.17-6.33 to get the heavy mass moving. The advent of the Doug Nash 5 speeds helped too and some were wheel standing monsters. A freind of mine's brother had an old Willy's sedan that they actually added weight to to make G/Gas. I used to sit at the top end of the track and listen to them come across the finish line. No other sound like it.

Pat