Edelbrock Fuel Injection Manifold for Mustang 5.0 - Question

[Dr G]

Hello - I just bought an Edelbrock fuel injection manifold for the 302 based 347 in my 56 F100. Currently the engine has an Edelbrock Air Gap manifold with a Holly 4150.

The new manifod has some features that I do not currently have. And I am trying to figure out what they are for so I can assess how to deal with them.



Regarding the large hole in the backside of the manifold. It leads into the lifter valley. What is this for? Exhaust gas recirculation? I assume I can just block this off.

Then there is this circtuitous passage leading from the throttle body area to the cylinder head shown in these two photos (entrance and exit):





I am not even sure that the heads on my engine have anything for this passage to lead into. I was planning to also block this off.

It would be good to know what these features are intended for, so that I can be confident in ignoring them. If anyone can lend assistance it would be most appreciated.

Gustave

[67TXStang]

There is normally the port between the intake runners on the intake. It is often referred to as the 'exhaust crossover'. My aftermarket heads (Edelbrock) don't have a matching port but the stock heads did. It allows some exhaust gas to flow into the intake to help the engine warm up faster.

The Fel-Pro intake gaskets I've purchased (1250) aways include a block off gasket for this port. I blocked mine off.

I'm not sure about the others.

[Dr G]

There is normally the port between the intake runners on the intake. It is often referred to as the 'exhaust crossover'. My aftermarket heads (Edelbrock) don't have a matching port but the stock heads did. It allows some exhaust gas to flow into the intake to help the engine warm up faster.

The Fel-Pro intake gaskets I've purchased (1250) aways include a block off gasket for this port. I blocked mine off.

I'm not sure about the others.

OK, thanks. That may well be it. Some part of the EGR process. Since I do not have the throttle body transition, which contains much of the emmisions connections, it is difficult to know more until I pull the existing intake off and look at the heads.

The other large hole I asked about turns out to be for the positive crankcase ventilation system (PCV). I'll probably route that to the exhaust.

Gustave

[RSX302]

OK, thanks. That may well be it. Some part of the EGR process. Since I do not have the throttle body transition, which contains much of the emmisions connections, it is difficult to know more until I pull the existing intake off and look at the heads.

The other large hole I asked about turns out to be for the positive crankcase ventilation system (PCV). I'll probably route that to the exhaust.

Gustave

Correct, the hole in the intake is emisions related (EGR) and pulls from the exhaust ports in the heads. Not needed for non emisions vehicles.


"The other large hole I asked about turns out to be for the positive crankcase ventilation system (PCV). I'll probably route that to the exhaust."

Should go to intake not exhaust..