What head gasket for boost? MLS leaking oil

OK, cool; thanks.

On the CR and such, I ran some numbers on this, working with 9.1 static CR and a 62* intake closing for your cam, and 11 psi boost, and I am pretty positive that you are on the ragged edge. I have a 2.6L Starion turbo running around 8.2 true static CR that I limit at around 14-15 psi, controlled with a waste gate, and if I push to 16-17 psi, bam-o the knock sensor starts going off, so I have that as a data point for the ragged edge. (Running 93 octane fuel, per US methods which gives a lower number than the Euro octane methods.... I dunno what you guys do for octane numbers there.)

Your engine at 9.1 SCR/11 psi/62* closing angle is running at the same level of estimated compressed DCR as my Starion with 8.2 SCR/14-15 psi/59* closing angle, with a set-up that is less optimum than the Starion engine. Chamber shape is less optimum, your pistons are down in the hole a bit, exposing the upper cylinder walls which tends to detonate more easily, and you have an iron head rather than aluminum, and you don't have piston oilers for piston cooling. Throw in a dry, cool day in April down under, and it all invites some detonation. (Plus we know nothing of your ignition timing or fuel...) You can back off ignition timing all day long, but if the detonation is off of hot piston edge or something like that, the retarded ignition timing won't prevent it. Soooo..... Lower boost? Better fuel?

It is not as bad as I thought, but you are on the edge, IMHO. I don't see the point on the cam LSA .... with a wider LSA, the intake closing will be later, and that will lower cylinder pressures a bit....But, heck, I may be associating the Comp cam with the wrong engine LOL

Not sure if this helps you or not.....