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Which body style do you have? 1999 was a transition year for the Silverado. Do you have the '88-'99 style or '99-'07 style? The older style will have a 5.7 350 engine with a distributor ignition and the newer style engine (5.3/4.8) has a coil pack on each cylinder. This is probably why there are 4 different ignition systems offered in 1999........
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2011 Summit White Camaro 1SS/RS
-6.2 LS3, TR6060, 3.45, G80
2004 Black Silverado 1500 2WD Regular Cab, Short Bed
-5.3 LM7, 4L60E, 3.42, G80
2014 White Caprice PPV
-6.0 L77, 6L80E, 2.92, G80
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