What size pulley is on a 2004 grand prix gtp comp g?

The 2004 Pontiac Grand Prix GTP Comp G doesn't have a single pulley size. It has a system of pulleys, including the crankshaft pulley, alternator pulley, power steering pump pulley, and an air conditioning compressor pulley (if equipped). Each of these has a different diameter. There's no single definitive answer without specifying *which* pulley you're asking about.

To find the size you need, you'll need to:

* Identify the specific pulley: Look at the pulley itself or a diagram of your engine's accessory drive system.

* Measure the pulley: The easiest way is to measure the outer diameter (OD) with a flexible measuring tape or calipers.

* Consult a parts diagram: Use your vehicle's VIN number to look up parts diagrams online (at sites like auto parts stores' websites) to find the specifications of each individual pulley.

Without more information, it's impossible to give you a precise answer.