Re: IML: Big Block Red Hot Manifolds

[Mike Pittinaro <mechimike@xxxxxxxxx>]

No catalytic converter on this one.  But the muffler
or pipes could be plugged.  I'll check.  

Timing was just set at factory spec, so I rule that
out.

Thanks!
-Mike

--- Christopher H <imperial67@xxxxxxxxxxxxx> wrote:

> Mike,
> 
> I tend to think a defective or clogged catalyst is
> behind this, but that
> usually accompanies a car being way down on power.
> Does your car have a cat?
> 
> Coolant temperature is not likely the cause. Your
> coolant won't get much
> hotter than 250F, whereas your combustion occurs at
> 2,400F or so. And I'd
> think super-lean running would not be smooth at
> idle.
> 
> Check downstream first... And start with the cat.
> Let us know, please!
> 
> Chris in LA
> 78 NYB Salon (400 w/cat)
> 
> 
> On 6/28/05 8:57 PM, Mike Pittinaro at
> mechimike@xxxxxxxxx wrote:
> 
> > Anyone care to lend a helping word of advice on
> what
> > could cause both manifolds on a 1978 400 cu in big
> > block to glow red?
> > 
> > Timing is set to the spec, new t-stat, new fan
> clutch,
> > radiator flows OK, belts/hoses OK and lower rad
> hose
> > has the internal spring.  New plugs and wires. 
> Engine
> > reverse flushed and new coolant installed.  New
> vacuum
> > lines and stoppers.  Engine has a thermoquad
> > carburetor.  
> > 
> > My own thoughts are a cracked base of the carb, or
> > possibly a leaking intake manifold, something that
> > would cause a lean-running situation.  Engine
> seems to
> > idle OK though, and has decent power.
> > 
> > --Mike Pittinaro
> 
> 
> 
> 
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--Mike Pittinaro

"The Surrealist seeks Kittens, runs on Alcohol, and has Three Metal Wheels."

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