If you’re upgrading to a 4-barrel carburetor, or replacing a restrictive OEM cast-iron intake, a performance intake manifold is in your future. But, installing one can be a tricky task if you’ve never done it before. Luckily, we have the necessary know-how and are happy to share it in this informative installation guide. So, read on and replace your intake manifold with ease.
Cleaning the intake mounting surfaces of your cylinder heads is one of the most important steps to a successful intake manifold installation. The better job you do here, the better chance your new intake won’t leak. Remove old gaskets, sealant or anything else that’s stuck on the mounting surfaces. DO NOT use a razor blade or scraping tool, as these can scratch mounting surfaces and cause vacuum leaks. Instead, use chemical gasket removers or denatured alcohol and a rag to scrub the cylinder head’s intake mounting surfaces clean.
If you had to remove your distributor, plug it back in and align the rotor to the mark you previously noted on the firewall. Using those photos you took earlier, reinstall everything you removed from your old manifold.
Now even though your intake is installed and your ride is running better than ever, your job isn’t done yet. That’s because as your motor warms and cools, parts that are bolted together can shift and loosen. This especially holds true when it comes to intake manifolds, and in many cases, problems can arise even weeks after installing one. So, for the first month of enjoying your new intake, be sure to recheck the tightness of the mounting bolts once per week.