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Author Message   Dooley Posted on Monday, September 01, 2008 - 10:31 pm:        i probably know the answer but I'm putting a 12 in my XB that had a 9. the 12 going in has broken mounting bolt holes in the heads were the mounts go so I was just gonna slap my 9 heads on there, well the question is do you think its absolutely necessary to replace the base gaskets also? I just don't want to take more apart than I have to...thanks   Texas_firebolt Posted on Tuesday, September 02, 2008 - 12:00 am:        yes, it is absolutely necessary to replace the base gaskets anytime you take the cylinder heads off. the base gaskets are a crush gasket the same as the head gasket is. that is also a good time to check the cylinder walls out and possibly throw a new set of rings in it, depending on the miles. i also prefer cometic gaskets in all my engine jobs   Point_doc Posted on Tuesday, September 02, 2008 - 12:48 am:        +1 cometics, I have them on mine.

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