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It depends if it is an OHV(pushrod motor) or a s.o.h.c./d.o.h.c. motor. Ohv engines can have a timing chain set that allow for adjustment, to be installed. You can also install crank keyways that adjust the timing by moving the crank cam gear the required degree/s. Overhead cam engines can have cam gears installed that allow for cam adjustments.
The 2005 Buick LaCrosse has overhead valves (OHV).
The 2001 Jeep Cherokee has overhead valves (OHV).
The 2010 Chevrolet Corvette has overhead valves (OHV).
The 2001 Jeep Wrangler has overhead valves (OHV).
The 2003 Buick Regal has overhead valves (OHV).
The 2008 Chevrolet Tahoe has overhead valves (OHV).
The 2012 RAM 2500 has overhead valves (OHV).
The 2005 Chevrolet Express has overhead valves (OHV).
The 2009 Jeep Wrangler has overhead valves (OHV).
The 2012 Chevrolet Tahoe has overhead valves (OHV).
The 2005 Chevrolet Tahoe has overhead valves (OHV).