1. Preparation is Key:
* Safety First: Disconnect the negative battery terminal. Wear safety glasses and gloves. Work in a well-ventilated area.
* Gather Tools: You'll need a socket set (various sizes), wrenches (various sizes), a drain pan (large enough for several quarts of oil), a putty knife or similar tool for scraping gasket material, a new oil pan gasket, possibly a new oil pan drain plug gasket, and jack stands (absolutely crucial).
* Raise the Car: Securely jack up the front of the car and support it with jack stands. Never work under a car supported only by a jack.
* Drain the Oil: Remove the oil drain plug and let the oil drain completely into your drain pan. Be patient – it takes time.
2. Accessing the Oil Pan:
* Remove the Skid Plate (if applicable): Some 1968 GTOs might have a skid plate protecting the bottom of the engine. If present, remove it. This usually involves a few bolts.
* Disconnect any interference: Depending on your specific GTO's configuration, you might need to loosen or remove other components that obstruct access to the oil pan. This could include things like exhaust components, suspension parts (rare, but possible), or accessories on the bottom of the engine.
3. Removing the Oil Pan:
* Remove the Oil Pan Bolts: Carefully remove all the oil pan bolts. They're usually located around the perimeter of the pan. Keep track of where each bolt came from, as they might be slightly different lengths. Use a socket that fits snugly to avoid stripping the bolt heads.
* Separate the Oil Pan: Once all bolts are out, gently pry the oil pan away from the engine block. Use a putty knife or similar tool to carefully break the seal between the oil pan and the engine block. The old gasket will likely stick to either the pan or the engine; try to remove as much as possible. Be very gentle; you don't want to bend the oil pan or damage the engine block. Work your way around the perimeter.
* Inspect the Oil Pan: Check the oil pan for any damage. If it's dented or otherwise compromised, you'll need a replacement.
4. Cleaning and Reassembly:
* Clean the Surfaces: Thoroughly clean the mating surfaces of the engine block and oil pan using a gasket scraper and solvent to remove all traces of the old gasket.
* Install New Gasket: Carefully install the new oil pan gasket onto the engine block according to the instructions on the gasket packaging.
* Attach the Oil Pan: Align the oil pan with the engine block and carefully bolt it back into place, tightening the bolts in a criss-cross pattern to ensure even pressure. Don't overtighten!
* Replace the Drain Plug: Install a new oil drain plug gasket and tighten the drain plug.
* Reinstall any removed components: Put back any components you removed to access the oil pan.
* Lower the Car: Carefully lower the car to the ground.
* Add New Oil: Add the correct amount and type of oil for your 350 engine (check your owner's manual).
* Check for Leaks: Start the engine and let it run for a few minutes, then check for any leaks around the oil pan.
Important Notes:
* Consult a Repair Manual: A shop manual specific to your 1968 Pontiac GTO with a 350 engine is highly recommended. It will have detailed diagrams and torque specifications.
* Torque Specifications: Always use the correct torque specifications for the oil pan bolts. Over-tightening can damage the oil pan or engine block. Under-tightening can lead to leaks.
* Professional Help: If you're not comfortable performing this task yourself, take your car to a qualified mechanic.
This is a general guide. Variations may exist depending on the specific modifications or condition of your GTO. Always prioritize safety and double-check your work before starting the engine.
