Setting the valves on a Chevy 350 engine involves adjusting the valve lash, which is the clearance between the rocker arm and the valve stem. Here's a step-by-step guide on how to set the valves on a Chevy 350:
Prepare the engine: Ensure the engine is at top dead center (TDC) for the cylinder you're working on. You can do this by aligning the timing marks on the harmonic balancer and timing cover or by feeling for compression on the spark plug hole.
Identify the cylinder: Determine which cylinder you'll be adjusting the valves on. The firing order of a Chevy 350 V8 is 1-8-4-3-6-5-7-2, and the cylinders are numbered from the front of the engine, left to right: 1-3-5-7 on the driver's side and 2-4-6-8 on the passenger side.
Adjust intake valve: Locate the intake valve rocker arm on the cylinder you're working on. Using a wrench or socket, loosen the lock nut on the rocker arm. Then, use a feeler gauge to measure the valve lash between the rocker arm and the valve stem. Refer to your engine's specifications for the recommended valve lash. Adjust the lash by turning the adjusting screw on the rocker arm until the feeler gauge is snug but can still slide in and out with slight resistance. Hold the adjusting screw in place and tighten the lock nut.
Adjust exhaust valve: Locate the exhaust valve rocker arm on the same cylinder. Follow the same process as step 3 to adjust the exhaust valve lash to the recommended specification.
Repeat for other cylinders: Move on to the next cylinder in the firing order and repeat steps 3 and 4 for each cylinder, adjusting both the intake and exhaust valves in the correct order.
Double-check adjustments: Once you've adjusted all the valves, go back and double-check each one to ensure the correct valve lash. It's essential to have the proper clearance for proper valve operation.
Reassemble and test: After setting the valves on all cylinders, reassemble any components you may have removed and start the engine. Listen for any unusual noises or valve ticking. If you hear any excessive noise, recheck the valve lash on that specific cylinder.
Remember, this is a general guide, and specific instructions or specifications may vary depending on your engine model and any modifications that have been made. Always consult the manufacturer's manual or reputable resources for precise instructions for your Chevy 350 engine.