Big Block intake swapping..

famous bob said

I check the bolt holes, but more interested in the port alignment, the bolt holes can be manipulated same as the ports to a certain extent
I have not had a mopar intake that was ever off very far. SBC/ DIFF STORY. Both the 426 hemi`s I had were spot on perfect !

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Famous Guy I bet you do the same as I. Before I install the heads I ensure that the bolt holes and the ports in the head are aligned properly. Then before I install the intake I ensure that the bolt holes and ports in the intake are aligned properly. That is why God made porting tools, gaskets, felt pens and awls. I have personally never moved the bolt holes. If the bolt holes are so far off you cannot correct the ports, then the intake manufacture screwed up and you send the intake back and get a good one.

As this is about reusing the valley pan gasket, the only time I reuse the valley pan is when I'm testing 5 or 6 intakes during dyno runs. Yes I check the fitment and parallel before the tests.