[Plums]

Gee whiz bang...

Sorry for the tricky post Lobelly. I apologise profusely for posting information that may be confusing.

Here is my new post that should cause no confusion:

[Start post

In my experience, 1 5/8 inch primaries are too small for an LS1.
If you are towing a caravan with an LS1 powered Adventra they'll be fine, but for anything else they're too small....

End post.]


Does it matter to me if people buy these headers? No, not at all.

Will the engine run with them? Of course it will. In all honesty, the difference between the different sizes isn't that much.

Why did I post in the first place? I just want to see my Darkside brothers get the best performance possible. Isn't that what we (Cobra people in general) are all about???

Do I think I'm qualified to comment on this topic??? I may be up myself here but yes I do. Firstly, I have tuned hundreds of LS1's. Secondly, (and probably more pertinant to this discussion) I have spent years doing R&D specifically for the LS1 with Pacemaker headers.

Edit: My "slightly true" comment relates to the fact that some cars running the factory program make slightly more torque with 1 5/8 headers as oppossed to 1 3/4 pipes. By slightly more I'm talking a few Nm's at the wheels, and only on some cars.