Re: Drag radial vs. rim width
With stock GM I think the 15x8 ralleys are 4" backspace so they stick out a bit far. You might want to get some aftermarket wheels.
GM Rally Wheels
XA 14X5 B-3 1/2 67 Chevy II with drum brakes
DA 14X5 B-3 7/8 67 Chevy II RALLY with disc brakes
DG 14X6 67 Camero & Chevelle with dics brakes
XB 14X6 B-4 3/8 67 Chevelle SS, 68-69 Chevelle with F-70 Tires, 70 Chevelle
XN 14X6 B-3 3/4 68-69 Camero & Nova with drum brakes. Different shaped outer
AE 14X6 B-4 3/8 70 Chevelle Station Wagon
XG 14X6 B-3 7/8 68-69 Camero with dics brakes, 68-70 Chevy II/ Nova with disc brakes, 69-69 El Camino without disc brakes. Wider drop center than normal
DE 14X6 B-4 3/8 71-72 Nova & Chevelle, 6 hole wheels
YW 14X6 B-4 3/8 Exactly like XB, may have come on same cars
YJ 14X7 B-4 3/8 69 Camero/ Chevy II L72- ZL1, 70 Nova
AV 14X7 70-72 Camero, 71-72 Nova, 6 hole wheel
XT 14X7 L72- ZL1 Non Rally Wheel
YA 14X7 B-4 3/8 69 Chevelle SS Wheel
AO 14X7 B-4 3/8 70 Camero &69 Chevelle SS Wheel
DB 15X5 67 Passenger Cars with disc brakes.
DF 15X6 B-4 1/16 67-68 Camero Z28
DC (BIG) 15X6 B-3 1/2 67 Corvette, No other stampings on rim
DC 15X6 B-3 1/2 68-70 Passenger car, 67 Passenger car (early models)
FI 15X6 B-3 1/2 68-70 Passenger car, 67 Passenger car (later models) Rivited instead of welded together
YS 15X6 B-3 1/2 68-70 El Camino
FW 15X7 B-4 1/4 71-up most any GM
AG 15X7 B-3 3/4 68 Corvette (will take 15x8 Beauty rings)
YH 15X7 B-4 1/4 L72- ZL1 Z28 Rally 69 narrow drop center
AD 15X7 B-4 1/4 L72- ZL1 Z28 Rally 68 wide drop center
AV 15X7 70, 71, 73 CAMARO Z28 5 spoke wheel
AZ 15X8 B-4 69-82 Corvette
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