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Yes, they will bolt on. No, I would not do it.
The flex heads have a different shape combustion chamber and
2cc difference in size. If you only need one head, don't mix them.
If you replace non flex heads into a flex car, it may not run totally as
expected.

bob
 

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I read that the compression ratio difference between standard vulcans and FFV Vulcans is from different pistons. Every source I've seen says the heads are identical.
 
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