I just finished installing a super ram plenum/runner kit on top of my 355. I also noticed after bolting the plenum on (gasp) that I didn't put the two manifold to runner bolts in that go in from the the manifold side. I have all the runner to manifold bolts that go in from the outside tightened and I'm hoping this will be good enough. Honestly, is it? I don't want coolant to leak from these bolts not being in, I'm not too worried about air leaking though, unless it's major, and I sure as hell don't want to have to re-install the plenum again.

 

IF you are talking about the 2 bolts that hold the runner on, one in the left rear, the other in the right front. Then were on the same page. IF you are running SD, then I would be only a little concerned. You might have alot of tuning problems if you are running MAF. Leaks & MAF are BAAAAADDD

As far as collent...hmm, if there the bolts I am thinking about then no, you should be fine, there is no collent that goes up the runners.

IF there is something else that I am not thinking about that your describing, then I dunno.

John

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Thanks for the reply. Yeah those are the two bolts I'm talking about and I am running MAF. Anybody else have any thoughts?

 

Those bolts wont cause any leaks at all, they dont go all the way through the runners, nor do they go into any passages in the manifold. I would put them in anyway, though. They are just to hold the runners down.

 

I'm not familar with those runners, but if there's a gasket between the surfaces that the missing bolt gos through, then best bet is to install the bolt.

Reason? You may think a little air (actually vacuum) leak is okay, but it's not, ask all the guys with melted pistons, broken skirts, code 44's, etc.

Besides, you're banking on the fact that the vacuum leak would be constant and even to both sides...most likely not.


Now if the bolts are for something else, excuse my ramblings.

 

Okfoz, actually SD is not that forgiving with a vacuum leak either as it does affect the MAP reading.

I too vote in installing the bolts as any vacuum leak is going to cause problems.