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All the spread port intake will interchange, 18 14 11 etc. The intake manifold faces are all the same angles, the degrees are referring to the valve angle from deck surface.
When I worked there ONLY the 18* intake would work with the 18* heads. ONLY 14* and 11* heads shared an intake. 18* head castings were there own and 14* and 11* heads shared the same casting.
 

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fmfire672;5686**** said:
That's what I was told also... thanks for your input
No problem. It sounds like you may have called Dart. If you haven't and have any questions about what you have you should call them. If your heads are 15 years old or older they might have had some different machining done to them and I could be wrong.
 

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OLD 18 degree castings (1990's) were not spread port like the heads available now.

CURRENT 18 14 11 12 share the same spread port configuration. An 18 degree spread port Dart manifold bolted to my 22538816 OLDS 14 degree heads.
Some are square port some are oval port. Intake manifold face angle will be the same.
A profiler spread port manifold will bolt to 18,14, 12, 11.
I just know when I worked there in the mid/late 2000's the 18* manifold was the only one to fit the 18* heads and the 14* and 11* would interchangeable. If you are referring to OLDS heads from the 90's then I honestly don't know. An 18* intake would not fit my 11* heads at all. I have a 14/11* Box Ram intake on my 11* heads. 18* BC heads we always had were square ports and 14/11* were always oval and had an option of 3 different ports we called A B or C port. I don't know anything about profiler.
 
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