Quetion about heads and intake

but i have a intake that matchs..

Then I have a intake that is much more open..

whats the differance? the intakes have diff cast numbers.. heads are all diff
Last edited by jay7199; Apr 17, 2010 at 02:35 AM.
yes the heads and one of the intakes has a missalignment, its not a perfect square on any of the ports.
how ever the other intake i have is a perfect square and seems much more open.
Not rocket science, GM just did not cast things to match perfectly.





