How to Replace Chevy V8 Intake Manifold Gaskets

Leaking intake manifold gaskets can result in poor performance and power loss. However, paying a mechanic to replace them can empty your pockets. Here’s how to tackle the job yourself to save money and restore performance to your Chevy.

What You’ll Need:

  • OEM Intake Manifold Gaskets
  • Gasket Scraper
  • Drain Pan
  • Antifreeze
  • Pliers
  • Flathead Screwdriver
  • Socket Wrench and Set of Sockets
  • RTV Silicone Sealant
  • Brake Cleaner
  • Spring Lock remover for Fuel Line

Step 1.

Put the drain pan under the radiator and open the drain with pliers to drain the radiator — close when it’s done. Remove the air cleaner while the radiator is draining. Using a screwdriver, loosen the hose clamp on the hose at the thermostat housing and pull it off. Do the same with the heater hose attached to the front of the intake manifold.

Step 2.

Remove the radiator support bracket and disconnect the fuel line.

Step 3.

Remove the throttle linkage and disconnect the throttle valve cable. Pull off any PCV hoses and disconnect the electrical plug from the coolant temperature sensor (if applicable).

Step 4.

Remove all bolts for the intake manifold and pry it away from the block using a screwdriver. Lift away the manifold.

Step 5.

Remove the intake manifold gaskets and scrape away all remaining gasket material. Use a cloth and brake cleaner to further clean the surfaces.

Step 6.

Put new intake gaskets into place and spread a coat of RTV sealant around the ports of the heads. Very carefully, install the manifold back onto the block and reinstall using steps 4-1.

It’s important that you are using genuine GM intake manifold gaskets for replacement. Aftermarket gaskets are often the wrong thickness and cause leaks and premature wear.