EJ257 with Manley 8:5.1 Pistons what thickness of headgasket is recommended?

 

If Manley are quoting 8:5.1 for the pistons they must be basing it on a particular head cc & gasket thickness, unless its just plucked out of thin air.


In reality if your building an engine you should cc your fitted piston & cyl head chamber as a matter of course, otherwise its just guesswork.