Lifetime Premium Member
Join Date: Sep 1998
Location: Ontario, Canada
Re: 1970 Chevelle LS6 quarter mile time
There can be quite a range in ETs depending on how the same car is set up. Our COPO Chevelle came from the factory with #68 primary jets and #76s in the secondaries. The advance curve didn't come in fully until around 5000 rpm. To say the least it didn't perform all that well and wouldn't launch at all with the no traction F70 X 14 Uniroyals. Just headers, jetting and advance curve changes made it like a different car. Still wouldn't launch at all but sure hauled once it did hook up. Adding slicks would knock several tenths off the et as the higher hp cars could easily lose 3-4 tenths right off the line with stock tires. Magazines tested in various modes, so it is hard to compare numbers without knowing what was done to the car first.