If you’re tackling an intake manifold leak on a GM V6 or V8 engine, the FEL-PRO MS 98003 T gasket set is one of the options you’ll encounter. It’s not a universal kit—it’s specifically designed for certain 3.1L, 3.4L, and 3.8L engines—but for those applications, it’s a well-regarded choice among DIYers and professional mechanics. This review examines what you get, how it performs, and where it might fall short.
The set includes the intake manifold gaskets, plenum gaskets, and often other small seals like O-rings or coolant passage seals, depending on the exact application. The “T” in the part number indicates a revised design, which addresses some of the failure points of earlier gaskets. FEL-PRO uses a composite material with a metal core and a rubberized coating, which is intended to handle the thermal expansion and contraction that can cause leaks over time. The gaskets are pre-formed to match the port shapes, so they drop in without trimming.
In real-world use, these gaskets are typically installed when you’re already deep into a repair—either fixing a coolant leak, addressing a rough idle, or replacing a failed intake manifold gasket. The job is labor-intensive on most of these engines, often requiring removal of the upper intake, fuel rails, and sometimes the alternator or other accessories. Because of that, you want a gasket that seals correctly the first time. The MS 98003 T has a decent reputation for doing that, provided the mating surfaces are clean and flat and the bolts are torqued properly.
One thing to note: this set does not include bolts or other hardware. If your original bolts are corroded or stretched, you’ll need to source those separately. Also, while the gaskets are designed for a stock engine, they may not be ideal for heavily modified engines with ported heads or aftermarket intakes—in those cases, you might need a custom gasket or a different material. Another limitation is that the set is vehicle-specific; it won’t fit every GM V6. You need to verify the part number against your engine code and year before ordering.
Compared to cheaper gasket sets, the FEL-PRO costs a bit more, but the difference is in the materials and the revised design. Some budget gaskets use a simple fiber composition that can degrade faster, especially in engines known for intake manifold issues. On the other hand, if you’re working on a low-mileage engine that just needs a quick fix, a less expensive set might suffice. But for a long-term repair, the extra cost is often justified. It’s also worth noting that some OEM gaskets are similar in price and quality, so it can come down to availability and brand preference.
Who is this for? It’s for the DIY mechanic or professional technician working on a compatible GM engine who wants a reliable, OE-quality replacement without paying dealership prices. It’s also for someone who values a revised design that addresses common failure points. Who is it not for? It’s not for engines outside the listed applications, nor for those who need a complete rebuild kit with bolts and other components. If you’re unsure about your engine’s specific needs, consult a repair manual or a trusted mechanic before purchasing.
Installation tips: clean the mating surfaces thoroughly, use a torque wrench, and follow the sequence in the service manual. Some users report that a thin layer of RTV sealant at the coolant passages can help, but that’s not strictly necessary if the surfaces are perfect. Also, be careful not to overtighten the bolts—the composite material can crack if you go beyond the specified torque.
Overall, the FEL-PRO MS 98003 T is a solid, no-nonsense gasket set that does its job. It’s not glamorous, and it won’t fix a warped manifold or a cracked head, but for a standard intake gasket replacement, it’s a dependable choice. Just be aware of its limitations and make sure it’s the right part for your engine before you start the job.