Author Topic: Intake hot spots, can't be good  (Read 1434 times)

TedS

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Intake hot spots, can't be good
« on: August 09, 2020, 03:23:12 PM »
I have 2 areas between intake runners that are hot spots. So much so that it's burning the paint off between runners 1 and 2 and runners 7 and 8. Whats the bad news?
« Last Edit: August 09, 2020, 03:25:33 PM by TedS »

68stangcjfb

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Re: Intake hot spots, can't be good
« Reply #1 on: August 09, 2020, 04:13:13 PM »
No bad news. The exhaust runs through the intake manifold on a 428 (and almost all FE engines) between runners 1 & 2, under the carb & runners 7 & 8 to warm the carb in winter. Some people (me included) block those ports on a restored engine so the paint doesn't burn in those spots & if you don't use the vehicle much in cold weather months. You can touch up the paint from time to time if they are not blocked.
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TedS

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Re: Intake hot spots, can't be good
« Reply #2 on: August 09, 2020, 04:43:15 PM »
Thanks, that's a relief. The car has had an alum intake for the last 45 years so I've never noticed it. Now trying to  use the cast iron itake so i see hot spots. Wish I'd known to blank the ports  when I swapped intakes. How is that done?

Drew Pojedinec

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Re: Intake hot spots, can't be good
« Reply #3 on: August 09, 2020, 04:55:00 PM »
I cut a small piece of sheet metal, knock it in with a punch. Cover with epoxy.
I live in the deep south, exhaust crossovers are not very useful here.

TedS

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Re: Intake hot spots, can't be good
« Reply #4 on: August 09, 2020, 06:18:05 PM »
That doesn't sound too difficult. Thanks Drew.

Coralsnake

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Re: Intake hot spots, can't be good
« Reply #5 on: August 09, 2020, 06:41:20 PM »
If you have spilled some fuel before that will accelerate the paint loss