2nd gen - performance intake - fix plenum leak?

rambob · Mar 2, 2012

I was cruising through summit racing site - maybe saw some options for a performance intake for the 318. its not much more than the hughes plenum fix, so I started thinking. it has to be removed either way. do the aftermarket intakes fix the plenum problem?

wermbang · Mar 2, 2012

Yes because it gets rid of the plenum.

WhiteExpress · Mar 2, 2012

The factory design is an aluminum manifold with a steel plenum plate.
Cheap, but stupid due to the different rates of expansion. Thus the gasket is continually being asked to flex far more than a normal one would.

Most aftermarket fixes use a plate aluminum plenum cover, thus removing the issue of different coefficients of expansion.

There are 2 intake manifolds available for the Magnum motors, one Edelbrock (at least it used to be) and the Mopar Performance M-1. Both do not have a plenum plate, thus it'll never leak.

2000DirtyDodge · Mar 3, 2012

Im very interested in the aftermarket manifolds. I would rather spend 299 on an Edlebrock RPM AirGap intake or the M-1 then put that crappy dodge one back on.

There are a few that fit our engine on the summit racing site...

WhiteExpress · Mar 3, 2012

2000DirtyDodge said:
Im very interested in the aftermarket manifolds. I would rather spend 299 on an Edlebrock RPM AirGap intake or the M-1 then put that crappy dodge one back on.

There are a few that fit our engine on the summit racing site...

You have to be careful with Summit, They list the Carborator manifolds too. Since they do technically fit our trucks. They just don't accept the injectors!

I don't know of the Edlebrock RPM AirGap has a fuel injected app. I know some engine maker was drilling the bosses so you could use the factory injection, but I don't believe it was being sold that way.

I agree. The factory design is very silly. While it's a good manifold design (overall) for a pickup truck, it's really crappy flowing at the top end.

2nd gen - performance intake - fix plenum leak?

rambob

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wermbang

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WhiteExpress

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2000DirtyDodge

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WhiteExpress

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