86mm Bore, what headgasket?

[craz azn]

So hypothetically, you build a 86mm, or even bigger M20. What are the options for headgaskets? Because I am rather skeptical about using a stock gasket meant for 84mm on an 86+....

Discuss please.

[brody]

Use a cometic mls and order it for the desired bore size. Easy.

[nando]

nah. stock is fine for 86mm. MM has been doing it for what, 20 years?

I think they have something special for 87mm, but those were race only motors and they don't build them anymore..

[craz azn]

^ MM bored an M20 out to 87?!

[nando]

yeah, all the time.