Machine Shop, O Ring head

[FattyBoomBatty]

That's what I did. Stainless steel "safety" wire. Then a regular gasket. But I surpassed my old boost level (by one psi) and it held together, so in my mind it works. The true test will be 30psi. Also, I think it would be better to o-ring the block since it's probably easier to get the groove centered on the bore. With a head, the bore centers might be slightly different than the block or inconsistent from hole to hole.

[blackrosenova400]

I run 35+ psi with a Fel Pro Permatorque and Arp L19's. Unless you are running crazy ass cylinder pressure, you dont need to o-ring your block.

Proper preparation is the main key, make sure your block and head are straight and your good to go.