I'm telling you, that .2CC in one engine that you found, is about equivalent to finding a needle in a haystack.
Everyone knows that manufacturing tolerances are just that, and these are cast, unmachined combustion chambers.
Yes, the castings are much cleaner, but one head out of millions does not=all Vortec heads are exactly 64CC. I know for a fact I can find others that have CC'd stock Vortec heads and NOT come up with 64CC. I can also find where GM literature has been wrong. So what, I'm just saying what GM SAYS.
Static/dynamic, who cares? If the casting is xxCC's, it is, and thats that. You build knowing that info. If you don't CC your heads, then you don't know for sure. We can go by your one test, GM's numbers, or what anyone else posts as to being the CC's. Heck, that could be a measuring error stemming from the items used to measure! .2CC out of 64 works out to *almost* 1/5th of 1% if I've got my math right.
Heck, I've got a pair that have the tapped accesory holes open to the rocker area. That doesn't mean all Vortecs will leak out of the accessory holes.
I hope it's understood I'm not trying to argue here, just pointing out that one or two samples out of millions isn't enough to say authoritatively that things are one way. If you get a few more samples covering a spread of a few years, and got the same results, I'd be very much inclined to believe that it's the case for all of them!
Not only that, but I posted specs for ONLY 1996...GM may very well have changed the head gasket or something between start and finish, no?
