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Re: [GMCnet] Intake manifold question [message #257536 is a reply to message #257535] |
Sat, 02 August 2014 15:27 |
Carl S.
Messages: 4186 Registered: January 2009 Location: Tucson, AZ.
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emerystora wrote on Sat, 02 August 2014 13:13Carl
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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Emery, I had the same problem only with the back 'China wall' seal. I used enough Right Stuff, but evidently nicked it when I lowered the manifold into place. I had to remove the distributor to clean the area up, but after I worked some more Right Stuff into the (small) hole, it has never leaked since. I have rebuilt several engines and had the top end off of several more, so this was not a big deal for me. However, I DID approach the job with quite a bit of GMC Net inspired anxiety. Like most things things I have done to the coach, it turned out to be no big deal.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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