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Kirkham Motorsports

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  #1 (permalink)  
Old 07-24-2024, 11:53 PM
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Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
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Exclamation Well,...

...perhaps starting a new thread on this topic would be the best way of engaging a discussion, Carmine. Your post may not be getting enough exposure buried in here...
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Old 07-25-2024, 11:08 AM
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carmine,

Here's an elderly thread about gaskets creeping: 390 problems | Capital Area Cobra Club

It has been a problem with lots of different engines, 351, 385, FE and so on. And if you search on Print-o-Seal you'll probably find other photos of the same problem, different engines.

The solution is to use only gaskets with a steel shim sandwiched between the gasket surfaces for street engines. Even the gasket maker admitted this was a problem.

Just using the gaskets for racing proved OK since they were replaced frequently. Street use with many more heat cycles resulted in creeping, allowing gas and water leakage to occur.

Bottom line: use the reinforced gaskets for street!

Tom
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Old 07-25-2024, 12:48 PM
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Thanks Tom,

I agreed with you on the steel reinforced gaskets if your using an aluminum intake for a 4 barrel carb that is designed to be structurally more ridged and weighs on average 2lbs heavier but totally different scenario if it’s a weber style intake like I pictured above.

I have used steel sandwiched gaskets while also including re-machining the intake to perfectly match my head angles.

What I did in my photos is the only thing that corrected the problem of gasket walking and linkage readjustment. I can now use most any style gaskets without steel reinforced and no more problems.
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