Kwazii

Anyone running a graphite head gasket from 928 Motorsports? I'm trying to decide which head gasket to buy and this is a contender. I like that the block and head don't have to be machined, but it's only rated to 14 psi. What are your thoughts?

finally!

Hmmm... I just put one on, with ARP head studs torqued to 95 foot pounds. Wondering if that combo is good for higher boost?
Awaiting AN8 fitting, stupid Amazon delay, before can start it up...

Following..

finally!

More info from a friend who is very knowledgeable..
No it was “tested to 14” cuz it was on a 928 and 928's are not built for boost... I’m running the same gasket and will be running 20-22psi. I’m not worried, it’s a good gasket.

IOW, it was only tested for 928 which do not need more than 14. Consensus is it is good for well over 14

Carl Fausett

I do not think we say that. I think we say the head does not have to be re-torqued. Yes, you should always check the deck and head for flatness. Blocks rarely warp, but heads often do. The GCS gasket is more compliant than a MLS gasket, but even the GCS has its limits...

Kwazii

Oh yeah, the surfaces should definitely be flat. What I meant was that your gasket doesn’t require a certain surface roughness like others do

eman930

yeah keep in mind that 928!has like 10:1 compression ration vs our 8.5, also 14psi on a 928 is like 900hp lol. This gasket will work great on a 951, I have one installed with raceware studs, awaiting my cams and I should be up and running around 22psi or so.

SamGrant951

Are they ever going to be offered in larger sizes (106mm)?

David Floyd

I need a 106mm also

Kwazii

Thanks, everyone, for setting me straight. I don't know much about the 928

I'll go with the GCS. Now I just need to figure out all the other gaskets and seals I should replace "while i'm in there".

Carl Fausett

I can do a special manufacturing run if you get 10 of the same. So get 10 guys who want a 106mm 951 GCS head gasket, and I'll work to make it happen.

Dash01

Where to get more info on carbon fiber HG?

Carl Fausett

https://928motorsports.com/parts/gcs_head_gasket.php