I have yet to see anybody measure the heads or a gasket correctly. For instance if you are going to measure bolt or hole locations you must first find the centerline (C/L) then base your measurement off the C/L. How can a comparison be made if hole diameters differ?

There are more wrong ways to measure than right ways. I have seen so many brand name gaskets that are wrong and I've also seen many cylinder heads that have machining inaccuracies. Be it from slop in the table or head of the machine or bad blue print info.

Also you should never use a gasket to base a port match from, it may be wrong.

Maybe y'all should try a different brand gasket shruggy
I may know somebody wink