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Bolt pattern for a 1985 GMC Sierra Classic 1500 is 6x5.5 (That is what mine is)
6x5.5
6x5.5
6x5.5
6 x 5.5
The 2007 GMC Sierra-1500 has 16 valves.
The 2010 GMC Sierra-1500 has a V6 engine.
The 2006 GMC Sierra-1500 has 12 valves.
The 2004 GMC Sierra-1500 has 12 valves.
The 2011 GMC Sierra-1500 has a V6 engine.
The 2002 GMC Sierra-1500 has 12 valves.
The 2010 GMC Sierra-1500 has 12 valves.