Headman Header Gaskets

Just a thought. Here's what I've done for years, with good results. And I presently running Heddman W2 gasgets.

1. I'v always cut the flanges between the front, centre and rear ports to just 1/16" left to allow flex.
2. And this is a must for me. I use studs almost entirely, instead of those small-headed cap screws that all manufacturers give. Studs, with never-sieze, will always give a higher torque value than the screws. Yes. They are a pain, but it minimizes the leakes for me.