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Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326216 is a reply to message #326190] Tue, 21 November 2017 14:54 Go to previous messageGo to previous message
Richard Denney is currently offline  Richard Denney   United States
Messages: 920
Registered: April 2010
Karma:
Senior Member
Scott, I would not get too panicky about it. I installed my aluminum
manifold a couple of times without issue, using headless bolts as alignment
devices, and following Dick Paterson's instructions on where to apply
sealant.

One trick not mentioned is to use a mirror to confirm that the RTV bead at
the fore and aft ends of the lifter galley make full contact. That bead
will be filling a gap of about 1/8".

Then, let the silicone cure for a day before checking the torque and
starting the engine. Cycle the engine through its full heat range and check
torque again.

I never had a problem with my second-generation Rockwell manifold.

You see them used because they survive a failed engine, and they aren't
cracked like many iron manifolds. Just a few precautions will be needed.

Rick "Laughing at the thought of Ken Henderson, 80-going-on-60, not being
able to lift a manifold" Denney

On Mon, Nov 20, 2017 at 6:34 PM Scott Nutter wrote:

> All good points and ideas.
> Especially James Hupy's detailed dissertation on the install.
>
> Honestly, I'm getting more feed back on the negatives vs the good. And
> there seems to be more people wanting to sell their used aluminum manifolds
> than used steel manifolds.
>
> The aluminum manifold seems to be less "forgiving" if not installed
> perfectly, and installing while leaning over the engine Hatch is not a
> perfect
> situation.
>
> So all in all the new aluminum low profile manifolds and not patterned
> exactly as the original manifolds..
>
> Maybe the best option is just to fill the crossover ports and also use the
> block off plates and stay with the steel manifold.
> Thanks, Scott.
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi.
> Houston, Texas
>
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--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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