ya you would need a 90.5mm headgasket stock headgaskets are 89.5 i would go with the new cosworth if you can afford it or get a cometic til you can save up but since your doing a full engine build id just get the cosworth while your at it there known for there hi performance and high pressures of boost and roughly 170 dollars tunermt on here knows quite a bit about them and also sell them or go to brewedmotorsports.com
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