GLM Exhaust Manifold

I didn't know that PCM made replacements. I thought they were all aftermarket.

Why not just buy the oem PCM replacement manifolds and reuse your old risers?

I replaced mine this past spring due to the same leakage. The problem isn't them leaking on the outside, the problem is when they start leaking on the inside. Once mine started on the outside I decided it wasn't work taking a chance and destroying my engine. Make sure you order new gaskets for both the manifold and the riser as you'll probably tear the old ones up when you remove them. Also, not sure if you've tried to take the bolts out but you'll probably need to soak them in some kind of penetrating oil for a while first. I kept spraying pb blaster on about once every week or two all winter last year before I started trying to remove the bolts. I then took a 20v impact wrench with the right size allen wrench and just lightly tapped them out. I didn't have a single issue getting any of them out and mine is a 92 model. Good luck. I did a lot of praying too! LOL

It'll bolt up, but you'll notice it says Indmar and Barr replacement.

They are different than a PCM and you'll need to get risers to match these manifolds.

They bolt on with only 4 bolts per side instead of 8 allen headed ones like the PCM. Not a problem at all with getting a good seal though.

On a 351 without GT-40p heads, spark plug access is a little harder, you need a box end wrench to break them loose, a spark plug socket on a ratchet doesn't fit all 8 plugs.

Once you do it once, plug removal is pretty easy.

Pcm 5.8 = 351w... so yes it will bolt up to the engine. Is that the question?