The new motor we put in seems to have blown a headgasket so I've strews to pull the motor out to strip down and freshen up. I'm looking at using some cosworth metal headgaskets and was just wondering what headgaskets you have used on your build an if these gaskets are worth buying. It seems the headgaskets seethe weakpoint of the ej20g's so I would like to strengthen that area as eat I can. I will be sending the heads off to clean up and skim if needed.

Also while I am there is there anything else worth upgrading. The aim of this car is to be a daily with trackwork on the side and for bow we want to keep to standard turbo running 10psi low boost and around 15psi high boost. I have considered a set or arp headstuds but again I want some opinions from those who have used them to see if it's worth it.

EJ 207, job done.

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500+hp and helis on tap, eta - June 2025.

Factory STi metal gaskets work perfectly.. i.e. the ones used on EJ207s.

If they fit the EJ20G, use them.

I do not understand the need of low/high boost for this application.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

i used subaru gaskets, and have been told mms and rms use the same
its a certain type that are a lot thicker than normal ones, cannot remember the part number
although that is on a 207

We don't have the coin to convert to a 207 this is my fiancée daily and basically doing a freshenup. I'm doing it myself. So are the Subaru gaskets better than the cosworth gaskets? It's not that much difference in price so I'd like to use the best.
As for what I meant by other parts insert of meant are there any other realist parts on these motors? For example if the big en bearings are a weakpoint the $200ish it cost for better quality bearings aren't much since it will be apart. I'm not looking to through $2000 worth of forties in or anything as we are just looking for a reliable motor we can boost at 15psi and not have to worry it's gonna blow another headgasket or anything. just want a reliable mildly tuned daily.

Edit: the high low was what my fiancé wants, 10psi for everyday driving. 15psi for track days.

Seeing as the factory motor runs around 14 psi of boost, I'd say stock head gaskets will work just fine with 15 psi.

As long as the mating surfaces are clean and flat, and head bolt torques are as per factory spec, you won't have an issue.

correction: 94-96 run 12psi.

but you should do this. use stock gaskets and make sure the rebuild is done properly.

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deadly treadly

Must be 97+ that run the bigger boost (with the smaller TD04)

Either way, 12 psi -> 15 psi shouldn't stress the engine much at all.

Tell her that having 2 boost settings is stupid. Just dont boost when going to the shops.