.030
champion rc12yc
.30
1978 Chevrolet Corvette 5.7L 4BL OHV 8cylThe Spark Plug Gap.045 (In thousandths of an inch)
SPARK PLUG GAP1992 Pontiac Bonneville 3.8L SFI OHV 6cylThe Spark Plug Gap.060 (In thousandths of an inch) Caution! Gap is not adjustable on certain plug brands
Champion RC12YC
1996 Chevrolet Impala SS 5.7L SFI OHV 8cylThe Spark Plug Gap.050 (In thousandths of an inch)
.054 inch for your 4.0 L OHV engine
Champion RC-12YC at 0.030"
1969 GMC Truck C1500 1/2ton P/U 2WD 5.7L 2BL OHV 8cylThe Spark Plug Gap.035 (In thousandths of an inch 1969 GMC Truck C1500 1/2ton P/U 2WD 5.7L 4BL OHV 8cylThe Spark Plug Gap.035 (In thousandths of an inch)
try .030 unless it is an Intek OHV and then 0.020"
2003 Buick Century 3.1L SFI OHV 6cylThe Spark Plug Gap.060 (In thousandths of an inch)
front right of engine, from driver seat perspective, follow the 1/4 inch spark cable down to where plug is