I have an '86 F250 automatic with a stock carburated 460 engine. I am in the process of replacing my intake manifold gasket and I noticed that the rear water ports on the heads are blocked because there are no corresponding holes on the intake manifold.

My old gasket set also had no holes for the rear water ports, but the new one I picked up does.

Can anyone shed some some light on this for me? Do I have the correct intake manifold? Will it harm anything to have the rear ports blocked?

Thanks,

Jason

 

The rear crossover is ok to be missing on a aluminum intake manifold. Look at it this way, if you had both crossovers you would heat the manifold and it would creep into the carb boiling the gas. You can use the intake gasket you have with no problems just remember to use rtv around the water and intake ports.

 

Thanks for the advice.

Incidently, my intake manifold is way too heavy to be aluminum, it must be cast iron. Additionally, the new gasket set consists of a pair of metal gaskets riveted to each side of the valley pan. Would this affect the use of RTV around the water ports?

Jason

 

Do you have any identifying marks or casting #'s on the intake? And yes RTV is fine to use on the valley pan style gasket.

 

I thought you might ask and I almost included them in my last reply.

Next to the Ford logo it says 6E30.
Next to the Firing order 15426378 it says D9TE-DA.

Do these numbers mean anything to you?

Jason

 

Oh, I forgot, there is also a "number wheel" in the casting like they use for manufacture dates on things, but there are only four numbers on the wheel (9758) and the pointer points to the 8.
There is also a stray number 12 stamped to the right of the firing order. I don'y know if these two things mean anything.

 

The D9TE-DA simply means the intake was made in 1979 and is a truck manifold. 6E30 is the date code. I am not relly good with the date codes yet.

 

That's the same engineering number my 86's intake sports, so, it's likley the stocker. I'll soon be pulling the intake off of mine, and, it'll probably be the same.
Evan

 

In reality you only need the water openings in one end of the intake gasket. Most gaskets are cut with the water opening on both ends so you can put them on either side and not get them mixed up.

 

Pond,
"Additionally, the new gasket set consists of a pair of metal gaskets riveted to each side of the valley pan. Would this affect the use of RTV around the water ports?" I am starting the same project.How did you seal pan/head and pan to manifold? What about the little nubs from the riveting- problem? Did you RTV beneath the pan and then the manifold gasket between manifold and pan? Thank you.

 

The rivets won't hit. Lose the cork or rubber ends seals. I used a bead of rtv black under the valley pan on the ends rails only. Same place on top and just a little around the water ports only. That gaskets is actually rubber covered so it needs no sealer around the ports. Fel Pro advised me against it and mine has been fine for 10,000 miles so far.

 

Thank you very much, Hired Gun - simple and straightforward instructions - just what I need.

 

Hi I'm new it's lit