RE: [Chrysler300] 300H Intake manifold gasket replacement
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RE: [Chrysler300] 300H Intake manifold gasket replacement

Mike, I've had a lot of experience installing intake manifolds on B/RB Mopars but have very little experience with Ram manifolds specifically. At one point I had a 383 'problem' engine that had been decked and shaved and goofed around with so much it would regularly start leaking internally between the runners and the lifter valley. I ended up having to add additional gaskets on either side of the valley tray, basically shims…..long story. 

Anyway, after that I started to over think all my installations for a number of years before realizing most engines require very little thinking at all. Just make sure the surfaces are clean, apply a liberal amount of gasket sealer in the corners, place the tray down followed immediately by the manifold. Start the bolts to align everything, then torque it down from the middle outward. If you use silicone on the mating surfaces, I found it helps to not quite complete the torque sequence until the sealer has set. Unless your heads and intake are not mating well, you shouldn't have a problem at all.

Happy New Year everyone!

Ryan Hill

CC: Chrysler300@xxxxxxxxxxxxxxx
To: mmoore8425@xxxxxxx
From: Chrysler300-noreply@xxxxxxxxxxxxxxx
Date: Thu, 31 Dec 2015 07:16:53 -0800
Subject: [Chrysler300] 300H Intake manifold gasket replacement

This is an FYI for all the folks who offered help how to make sure this intake manifold remains sealed. My problem is there was no obvious problem, so I missed something the last time I replaced it.

(Around 1988, while coming back from a show in Victoria BC, we developed a bad case of valve recession causing a guide failure, hot exhaust coming out of the valve cover etc.  We got to Ray Doern’s home in Portland and in his back yard, pulled both heads that night. We got the heads to a machine shop at 10 pm. We picked them at noon next day, painted them and installed them wet. It was running that afternoon and we left at 7 the next morning. Needless to say, I may have overlooked something back then.)

One of the issues which Jeff Carter raised was using gasket sealer on the intake manifold valley gasket. There was one in particular he favored, but I have been unable to raise him over the holidays. I asked here and got a lot of good information.  I went to my local NAPA store yesterday and checked on the suggested sealers available, but remained undecided. I checked the directions on each of them and, they all had one or more of the following issues:

1. Specified to be NOT  fuel resistant.
2. Specified to be hardening and permanent.  
3. Not heat resistant.

I  settled on a Powermatex product but did not use it.
But then I carefully read the directions on the tiny tube which came with the Felpro gasket set. I noticed the application instruction drawings looked like my intake and block, so I used it instead. By using a small bead, there is just enough in that tiny tube to do exactly what they instruct you to do (ends of valley head to head, underside intake ports, install gasket, tops of intake ports.  
We will see. I hope to have it running soon.Thanks for all the suggestions.

Mike Moore


Posted by: Ryan Hill <ryan_hillc300@xxxxxxxxxxx>

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