The following are primary and secondary frequencies used assigned to 
NASCAR drivers.

Car #   Driver                  Primary     Secondary
 2      Ernie Irvan             466.650
 3      Dale Earnhardt          469.0125    464.0125
 4      Rick Wilson             464.300
 5      Geoff Bodine            851.4875
 6      Mark Martin             463.400     463.925
 7      Alan Kulwicki           461.150
 8      Bobby Hillin, Jr.       856.7875
 9      Bill Elliott            853.4875
11      Terry Labonte           855.5625    855.5125
12      Bobby Allison           451.900     464.3125    469.3125
17      Darrell Waltrip         851.5625    856.4875
21      Kyle Petty              463.4625    468.4625    463.4875
23      Eddie Bierschwale       462.675
25      Ken Schrader            856.9125    851.5625
26      Ricky Rudd              468.4875
27      Rusty Wallace           463.900     468.900
28      Davey Allison           468.700     463.5625    468.5625
29      Cale Yarborough         464.600     469.600
30      Mike Waltrip            466.300     461.300
33      Harry Gant              461.6875    461.975     466.975   464.525
43      Richard Petty           464.800     469.800
44      Sterling Marlin         461.875     466.875
52      Jimmy Means             464.400     469.400     464.925   469.925
55      Phil Parsons            468.775     464.450     469.450
71      Dave Marcus             467.825
75      Neil Bonnett            468.975     463.975
83      Lake Speed              463.775     468.775
88      Buddy Baker             466.700     461.700
90      Benny Parsons           467.1625
97      Morgan Shepherd         466.200
98      Ed Pimm                 461.525
NASCAR  F1= 464.500     F2= 464.775     F3= 464.900     F4= 469.500
Motor Racing Network= 454.000

Some Tips:  If you find a frequency you can't identify, wait until you hear the 
crew tell the driver his speed for the lap just completed.  The car you're 
looking for will probably be between the start/finish line and turn one.  The 
frequencies are assigned to the cars; so if a driver switches cars, he used the 
frequency in the new car (i.e., Mike Alexander is driving Bobby Allison's 
No. 12).  The NASCAR media sheet lists 97 cars, so there could be other 
frequencies used during a race.