Power difference in early (A) and later (C) 428CJ intake manifolds?

[gt350hr]

  While I am new to this site , I'm not a newbie by any means. I am curious if anyone ( Blair or Jay) have done a back to back on the C8OE-A "early" versus the common later C8OE-C Cobra Jet intakes.  Dennis K could probably look at the Ford blueprint to see what the change was  ( causing the casting number change) but I was wondering about power.
      Thanks in advance ,
         Randy

[jayb]

I have not done that test, and as far as I know I've never had an "A" intake here to test.  Quite a while back there was an article in Car Craft that claimed the manifolds marked with a "2" under the casting number made more power than the ones marked with a "1".  I did test a "1" and a "2" back to back, and there was no difference, so that article was BS.  Both of the intakes I tested were "C" intakes.

[wsu0702]

  While I am new to this site , I'm not a newbie by any means. I am curious if anyone ( Blair or Jay) have done a back to back on the C8OE-A "early" versus the common later C8OE-C Cobra Jet intakes.  Dennis K could probably look at the Ford blueprint to see what the change was  ( causing the casting number change) but I was wondering about power.
      Thanks in advance ,
         Randy

The 428CJ website has a lot of info on the differences between the -A and -C manifolds.  Based on the evidence presented there I doubt that there was any difference in performance.

https://www.428cobrajet.org/id-intake

[gt350hr]

      Jay,
         If you are ever interested , I would be happy to send you my A intake to test. They are pretty scarce so I'm not surprised you haven't seen one and that's the reason I don't want to "assume" they make the same power. The 1 and 2 thing on the C intake  is just a mold number. I saw that article and called BS on it too. I may try to test out here in Ca but the numbers would be different than yours for sure. One of the major reasons "I" appreciate your testing is it's all on the same dyno so the numbers are consistent. We both know different dynos often provide different numbers , both higher and lower.
   Thanks for letting me in here!

      wsu0702,
     Thank you. I have been a member over there for many years under the screen name 161854 , the vin of my 68.5 CJ FB. As I said , I'm not a newbie.

      Randy

[machoneman]

Great idea but...

I wonder if the test would end up within the margin of error, simply meaning the gain (or loss) of hp/torque would be so small as to call it testing error.

[gt350hr]

   That is a chance we take , and why it's called "testing". I've done lot's of things in my 50 years of drag racing that "should of" helped  but did nothing positive performance wise.