RD250 Exhaust Blowback at Exhaust Flange/Chamber header

[BlueR32]

Hi All,
I tried a few searches but perhaps I don't have the right keywords as nothing popped up. I have DG chambers on the project:
https://www.2strokeworld.net/forum/index.php?topic=3909.45

I'm getting quite a bit of unburnt oil/fuel blowback where the expansion chamber header fits over the flange. It's making a mess of the engine casings and even the front fender/mudguard. Any suggestions for how best to seal the connection?

[Striker1423]

Goop it up with very high temp RTV then reassemble.

[m in sc]

'the right atuff' sealant. it's not cheap but get the atuff in the cheez qhiz can. however, that's pretty normal for them to seep