Technical weird residue inside intake ?

took the carb off to do some work and noticed this dark redish residue inside the intake manifold.this is a new engine with about 1500 miles and a holley carb.I use a small amount of Sta-bil in my gas and 91 octane. any idea what this might be?

 

Looks like dried gas to me.

 

burnt dried up gas

 

Agreed-It's the crappy gas they want to make even crappier.( and more expensive)

 

I've had red residue in the carb even with E-0 gas.

 

sucking some ATF from the vacuum modulator?

 

Looks like you are about a 1/16" from a vacuum leak. Make sure your new gasket seals up that spot correctly.

 

Did you seal your gas tank with RedKote?

It does look like burnt, dry, gas though....

 

Maybe a bit of exhaust gas reversion? Maybe a "funny" camshaft with a lot of overlap or a lot of intake duration?

 

Doesn't look weird to me.
Looks like when gasoline is poured onto a hot surface. Like when a carburetor leaks onto an intake manifold.

 

normal varnish from the heat riser crossover . if your using non tax gas ( race gas ) you will get a red stain from the dye they use . has no effect on the flow or running of the motor .

 

no vacuum 700r4

 

mild cam and exhaust crossovers blocked.

 

what spot are you talkin about?

 

In your top pic, see the dark line down the lower left side of the gasket? There must be a passage in the base of the carb. It almost reaches the edge of your gasket. Make sure your new gasket covers the passage and seals it.

 

Thanks for all the input.does anyone think that maybe it could be oil vapor sucked in through the pcv nose? I am thinking it may be dried gas too . I found a weird powdery residue inside the fuel bowls. I use two good quality filters. I changed them out then took the used ones apart and found nothing unusual inside. maybe it's just today's gas.

 

vacuum port on holley carb, gasket seals fine. thanks for lookin.

 

If its sticky it could be oil getting sucked by an intake gasket....good luck


Posted using the Full Custom H.A.M.B. App!

 

Looks like evaporated fuel that dripped from carb..

 

if your PCV is on the carb base yes it could be the mess as it will stain aluminum . as for the powder in the carb bowls , yep gas residue its whitish yellow , ussually the detergents and some film from alky drying out .