Kooks EGR fitting

[Chingon1]

Maybe it’s too late but, what heads are you running? Early gen C heads?? Or later C? I’m pretty sure the kooks headers are based on the b head exhaust ports that’s why they won’t match up. If your running DB or DC casting from a mach or cobra

Also also, I used ford performance exhaust gaskets on my 2V with SS studs off eBay and I havnt retightened them or had any leaks so far and it’s gone through a couple heat cycles already.

 

[XR7-4.6]

Remflex says 20 ft-lbs for the gaskets. And this:

Maybe it’s too late but, what heads are you running? Early gen C heads?? Or later C? I’m pretty sure the kooks headers are based on the b head exhaust ports that’s why they won’t match up. If your running DB or DC casting from a mach or cobra

Also also, I used ford performance exhaust gaskets on my 2V with SS studs off eBay and I havnt retightened them or had any leaks so far and it’s gone through a couple heat cycles already.

Later C heads, however the matchup isn’t them being oval vs rectangular C heads but that the kooks port is actually LARGER than the later C head port. Which is a good thing for flow, but not so good for gasket fit as I’d otherwise be able to use the same 03-04 Cobra MLS gaskets I currently have with manifolds. That’s where the GT500 MLS gasket come into play as where the bolt pattern is different funnily enough those extra large exhaust ports are almost identical to the SCP Kooks.

What is a bit of an issue however is with gaskets like remflex, as I have been researching this extensively the last few days as you can imagine and have seen threads on places like SVTperformance that they do have the 99-01 port shape which would be a restriction with my heads. It’s solvable with some dremeling but so is the GT500 MLS and so remains the debate for me. Both would need to be modified with the GT500 gaskets being the (substantially) more expensive of the two but I still am tending to lean towards them, but it’s like 51:49 atm and I really need to make a decision soon, so I’m stressing a bit.



Oh since I’m deep in Pandora’s box also what’s the general attitude of one piece flanges vs individual flanges? This thought popped up from a memory talking to Oscar when he was making(well planning to make) headers where he seemed to favor the latter. Kooks are one piece(on the passenger side) but I am perfectly willing to take a death wheel to them to separate them if it means a better seal and not risking warpage from heat cycles

 

[Grog6]

One piece flanges are better,from what I've heard people bitch about for the last 50 years. Separates move in weird directions, and leak individually.

 

[MadMikeyL]

Separate flanges may seal better the first time, but if you ever have to take them off and reinstall them after countless heat cycles, everything probably isn’t going to line up anymore.