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GM Timing Belt & Timing Chain Replacement
Timing belts are used in some overhead cam engines in General Motors vehicles to drive the cam (the 2. 0L for example, and the 1.6L engine in the Chevy Aveo), some use timing chains(2. 3L Quad Four, Cadillac Northstar dual overhead cam 4.6L V8, the Aurora Northstar 4.0L V8 and Chevy Vortec 4200 inline six), and some use a combination of both (Chevrolet 3.4L V6). The rest of the GM lineup (2.0/2.2L, 3100, 3300 and 3800 V6; 5.0, 5.7L and 7.4L V8, etc.) are all pushrod engines that use a traditional timing chain and gear set to turn the cam.
To better understand the cam drives on some of these GM applications, let's take a closer look at a few examples to see what is unique or different.
Adapted from an article written by Larry Carley for Underhood Service magazine