| Re: [GMCnet] Intake manifold question [message #257535 is a reply to message #257533] |
Sat, 02 August 2014 15:13   |
emerystora
Messages: 4442
Registered: January 2004
Karma:
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Senior Member |
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Carl
Those same people would likely have the same problems installing a factory stock manifold. It is not an issue with the Rockwell manifold but rather totally an installation problem. The do-it-yourselfers are generally not experienced manifold installers and often don't have the gaskets properly aligned or the front and back of the manifold sealed properly.
When I filled my manifold with the Mondello zinc material years back I had a leak on the front of the engine. I was able to fix it well by squeezing more RTV into the small pinhole. I thought I had done everything right but shit happens.
Emery Stora
77 Kingsley
Frederick, CO
On Aug 2, 2014, at 1:17 PM, Carl Stouffer wrote:
> GeorgeRud wrote on Fri, 01 August 2014 07:03
>> It seems there were several things used over the years to stop the heat under the carb, and the Rockwell manifold seems to be the most current
>> (though not cheapest) option. Is there a general consensus on how well the Rockwell is working (sealing issues?, other issues?) now that it's been
>> out for a while? Also, there was some talk about filling the crossover on the stock manifold with a product called HardBlock, but I don't know if
>> that was ever tried with results posted. That did sound like a reasonable solution that may also allow a cracked manifold to be salvaged, but I've
>> never heard any results.
>
>
>
> George,
>
> I think there are a large number of the Gary Rockwell intake manifolds installed on 455s. I have heard of several people having problems getting them
> sealed and sucking oil from the lifter gallery, causing high oil consumption. I installed one on my coach a few years ago with little drama. It has
> no exhaust crossover and I'm sure, runs cooler than the stock manifold. I'm not sure it has helped with the heat on the carburetor as much as one
> would think. I'm pretty sure it gets plenty hot anyway. From my point of view and experience, the Rockwell works as designed.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
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