327 Break-in Question - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 7th, 09, 07:16 PM Thread Starter
David
 
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327 Break-in Question

I was able to get my car started for the initial break-in but after about 5 min. the ceramic engine paint on the intake on the center coolant runner on each side of the carb began to blister. The rest of the intake was fine. Is this normal. What adjustments should I make to prevent this.
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post #2 of 6 (permalink) Old Aug 7th, 09, 07:27 PM
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Re: 327 Break-in Question

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Originally Posted by terrellda View Post
I was able to get my car started for the initial break-in but after about 5 min. the ceramic engine paint on the intake on the center coolant runner on each side of the carb began to blister. The rest of the intake was fine. Is this normal. What adjustments should I make to prevent this.
Thats not a coolant crossover..it is an exhaust crossover designed to heat the intake plenum floor under the carb.If this is undesireable to you..pull the intake and install gskts with stainless block off plates.

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post #3 of 6 (permalink) Old Aug 7th, 09, 07:28 PM
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Re: 327 Break-in Question

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Originally Posted by terrellda View Post
I was able to get my car started for the initial break-in but after about 5 min. the ceramic engine paint on the intake on the center coolant runner on each side of the carb began to blister. The rest of the intake was fine. Is this normal. What adjustments should I make to prevent this.
It's not a coolant passage it's an exhaust passage and it is normal to burn the paint off.

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post #4 of 6 (permalink) Old Aug 8th, 09, 07:54 AM
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Re: 327 Break-in Question

Check for frozen shut heat riser on the passenger side also.

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post #5 of 6 (permalink) Old Aug 8th, 09, 09:08 AM Thread Starter
David
 
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Re: 327 Break-in Question

I just don't understand why the paint is only blistering at those two locations. I used the same paint on the entire engine. I have replaced the entire exhaust system to include the heat riser on the passenger side. If I block off the exhaust runner will it prevent my choke from operating properly? (Original Quadrajet w/manual choke) Should I just wait until after the break-in is done and clean and repaint the intake?
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post #6 of 6 (permalink) Old Aug 8th, 09, 09:31 AM
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Re: 327 Break-in Question

Exhaust gas is hot, aka, 500F typically. If you do clean & paint again, it will bubble again unless you wire the heat riser valve open or replace it with a spacer.
The reason its blistering at those two spots is the turns the gases make going through the manifold from one side to the other side of the manifold.

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