IML: Big Block Red Hot Manifolds

[Mike Pittinaro <mechimike@xxxxxxxxx>]

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

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


		
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