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Author Topic: Intake Paint Tuning Brown  (Read 672 times)
tmodel66
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« on: May 28, 2012, 09:32:59 AM »

In the center of my intake under/around the choke well and on the opposite side in dead center (crossover) of the intake the paint is turning Brown. Is my engine over heating? What caused this? Is this "normal"? Does it have anything to do with the hot slots being plugged? Will it hurt anything?
« Last Edit: May 28, 2012, 10:36:22 AM by tmodel66 » Logged

Daniel  
'69 SS 350/4 speed  Fathom Green--POP
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« Reply #1 on: May 28, 2012, 10:11:00 AM »

I'm gonna guess its from the heat riser port getting hot.

John
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69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20
79 Z28 Brown LM1 M21
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Sauron327
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« Reply #2 on: May 28, 2012, 11:12:58 AM »

http://www.camaros.org/forum/index.php?topic=9142.0
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tmodel66
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« Reply #3 on: May 28, 2012, 12:53:27 PM »

Thanks Scott !! I had read that before but I either over looked it or forgot about it. Mine has just started showing signs of the paint turning brown and it scared me.
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Daniel  
'69 SS 350/4 speed  Fathom Green--POP
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« Reply #4 on: May 29, 2012, 08:49:40 AM »

I just changed out my gaskets and found the new run of the heat spacers are slightly thicker, and better quality then the old mid 2000's style. After a few tests I found a sandwich of fiber, tin heat and fiber sealed well and prevented higher alcohol based fuel mixtures from boiling off.  

I used to run the factory setup - fiber, then tin then carb base, but then a few years back the design changed and the fiber gaskets of many manufacturers were roasting out in a season or less and leaking badly. So I swapped positions putting the tin on first on the hot-slot, then fiber on top.

The divorced choke location can be protected by using a higher temp protection paint first then Chevrolet Orange on top of that.
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1969 Z-11 350/300 with 4 Speed
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