I am building a 3.5 motor and I am currently looking into head gaskets...my buddies in cali were telling me to wait for the new cosworth head gaskets since they always improve the previous versions. well they are currently out and i was actually waiting for about 4 months. but one question....stock bore is 95.5mm....they have 96mm bore head gaskets...would the .5mm make a significant difference? please input your repsonses. thank you

 

For n/a purposes, cosworth/cometic (cosworth is rebadged cometic according to many on my350z) and nismo head gaskets are interchangeable. For FI, HKS is the best choice. What are your plans for the motor?


And yes, 96mm is fine.

 

+1, HKS is actually a 97mm so 96mm will work fine.

 

BTW, what improvements have they made? Do these "buddies" work for cosworth?

 

they have an account with cosworth and they buy a lot from them since they work on many 240's all the time and few 350z. i ll send you a PM in a few...

 

here's the link for this.... http://www.cosworth.com/shop_item.php?productid=538

 

So, tell your buddies with said account to tell Cosworth to manufacture shorter HG's, lift CR a touch

 

Unpossibel. Any deviation in head gasket thickness significant enough to alter CR would also affect LIM and timing cover fitment.

 

but you're right.

 

a company that i know in PA has an account with cosworth and are using these gaskets on their single turbo 350z pushing 26psi. the guy told me to get these gaskets instead of hks..

 

What's their reasoning?