Speed Engineering Gaskets
Thread Starter
Intermediate
Joined: Nov 2024
Posts: 40
Likes: 0
From: Miami
Speed Engineering Gaskets
I got a c6 grandsport with speed engineering headers and their gaskets that came with the headers. I am currently experiencing some leaks from the headers debating on replacing the gaskets any recommendations for gaskets?
Intermediate
Joined: Nov 2024
Posts: 48
Likes: 34
I use Mahle MLS gaskets that are just like OEM. I also put a very thin coat of high temp copper RTV on the manifold side of the gasket. This strategy has worked great for me on high HP turbo LS setups.
I'm trying the same now on speed engineering headers on my own grand sport. The flange quality is pretty bad,pitted and warped. We'll see if it seals....
The graphite gaskets are garbage. They can blow out easily from the exhaust gases.
I'm trying the same now on speed engineering headers on my own grand sport. The flange quality is pretty bad,pitted and warped. We'll see if it seals....
The graphite gaskets are garbage. They can blow out easily from the exhaust gases.
Race Director
Joined: Oct 2012
Posts: 17,334
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From: Melbourne, FL
Burning Brakes
Joined: Apr 2023
Posts: 1,087
Likes: 392
From: Florida
2025 C6 of the Year Finalist - Unmodified
I’m about to install my speed engineering headers this weekend. I ordered some mls gaskets off amazon that had good reviews, hopefully they are better than the ones included with the kit.
Race Director
Joined: Oct 2012
Posts: 17,334
Likes: 6,509
From: Melbourne, FL
Hack mechanic tip - reuse the OEM gaskets on the head side as long as they're in decent shape. You can double up on those gaskets and be fine.
